If someone is not qualified for Karma Yoga he can practice Karma Kanda:

1-10: KY is better for you as you are not qualified for JY (of course Arjuna is a pure devotee and he is qualified for more than JY but in this context when Krishna is giving instructions at progressive levels and the level He is talking for if one is not qualified then JY can create disruption in society, can make one hypocritical and can make one’s livelihood also difficult.)

10-16: If you are not qualified even for KY then practice KK

17-24: If you are qualified for JY, still practice KY to set example

25-29: KY-KK difference

30-35: How KY elevates

36-43: Overcome lust, the main obstacle on the path of KY

Bg 3.10

saha-yajnah prajah srishtva

purovaca prajapatih

anena prasavishyadhvam

esha vo 'stv ishta-kama-dhuk

SYNONYMS

saha -- along with; yajnah -- sacrifices; prajah -- generations; srishtva -- creating; pura -- anciently; uvaca -- said; praja-patih -- the Lord of creatures; anena -- by this; prasavishyadhvam -- be more and more prosperous; eshah -- this; vah -- your; astu -- let it be; ishta -- of all desirable things; kama-dhuk -- bestower.

TRANSLATION

In the beginning of creation, the Lord of all creatures sent forth generations of men and demigods, along with sacrifices for Vishnu, and blessed them by saying, "Be thou happy by this yajna [sacrifice] because its performance will bestow upon you everything desirable for living happily and achieving liberation."

We have discussed spiral progression.

So here we will discuss if one is not qualified for KY then one should practice KK.

saha-yajnah, with Yajnah,

prajah srishtva, Prajah (all living beings) created

puro, in ancient time. Vaca, said. Prajapati, lord of all creatures

So different Acharyas refers Lord of creature as Vishnu or Brahma, SP has done a mix of both but the consequence is the same whoever we referred here.

So what does prajapatih says? anena prasavishyadhvam, so by this become prosperous become more and more prosperous.  

esha vo 'stv ishta-kama-dhuk, so let this be your ishta-kama-dhuk, Kama means desires, here Kama does not have a negative connotation. Kama means whatever your requirements, whatever your needs or necessities in life. So let this be your provider of ishta-kama-dhuk, whatever you desire it will provide.

So what is this referring to actually?

Krishna is telling the system of Yajna is there right from the beginning to creation. So when creation is made just like when Parents beget a child they arrange for taking care of the child. So similarly when Lord creates living being He makes arrangement to take care for them, what is that arrangement – it is system of Yajna so Yajna is esha vo 'stv ishta-kama-dhuk, let this be fulfiller of your desires, so in these verses Krishna talks about system of cosmic cooperation between the devatas, the Supreme Lord and the human beings, this will be discussed little later, so here we will discuss when Lord creates he doesn’t send living entities to wilderness we can see this how Lord arranges through nature, e.g. when a baby is born, food for child is arranged in the womb, milk is available through mother and all species everyone in this world gets their food. So how they get that? That is arranged by the Supreme Lord. So in this way this universe is perfectly complete. So the Lord has arranged to care for the needs of living beings.

Animals doe not have any karmic result they largely acts on their instincts for the sake of eating sleeping mating and defending, In human life we have advance level of consciousness we have capacity to regulate eating, sleeping, mating and defending and we have capacity to choose and so we can redirect our desire to choose spiritual desires, for human beings also Krishna provides necessaity of life but we have responsibility to discharge our material duty and spiritual duties.

SP in purport: mentioned about purpose of creation and how Lord Vishnu is the ultimate goal.

        The material creation by the Lord of creatures (Viṣṇu) is a chance offered to the conditioned souls to come back home – back to Godhead.

SP quotes from SB

(2.4.20) Śrīla Śukadeva Gosvāmī describes the Lord as pati in so many ways:

śriya patir yajña-pati prajā-patir
dhiy
āṁ patir loka-patir dharā-pati
patir gati
ś cāndhaka-vṛṣṇi-sātvatāṁ
pras
īdatāṁ me bhagavān satāṁ pati

The prajā-pati is Lord Viṣṇu, and He is the Lord of all living creatures, all worlds, and all beauties, and the protector of everyone. The Lord created this material world to enable the conditioned souls to learn how to perform yajñas (sacrices) for the satisfaction of Viṣṇu, so that while in the material world they can live very comfortably without anxiety, and after nishing the present material body they can enter into the kingdom of God. That is the whole program for the conditioned soul. By performance of yajña,the conditioned souls gradually become Kṛṣṇa conscious and become godly in all respects. In the Age of Kali, the sakīrtana-yajña (the chanting of the names of God) is recommended by the Vedic scriptures, 

Pati means master, husband or Lord.

So He is śriya patir – Lord of Goddess of fortune

 yajña-pati - Lord of Yajna

prajā-patir – master of all living entities

dhiyāṁ patir – master of intelligence

loka-patir – master of all abodes

dharā-pati -master of earth

patir gatiś cāndhaka-vṛṣṇi-sātvatāṁ - and these are various dynasties in which Lord Krishna has appeared.

O Lord you are the master of devotees, sātvatāṁ, transcendentalists.

So here SP is quoting to point that Praja-Pati refers to Lord Vishnu or Krishna who is Lord of everyone. And this Praja-Pati has manifested and He has given the system of Yajna and in Kaliyuga we practice the system of Sankirtan Yajna in this Yuga Kali Yuga.

He has further quoted about Lord Chaitanya:

Lord Kṛṣṇa in His devotional form (as Lord Caitanya) is mentioned in the Śrīmad-Bhāgavatam (11.5.32) as follows, with special reference to the sakīrtana-yajña:

kṛṣṇa-vara tviṣākṛṣṇa
s
āṅgopāṅgāstra-pāradam
yajñai
 sakīrtana-prāyair
yajanti hi su-medhasa

“In this Age of Kali, people who are endowed with sufcient intelligence will worship the Lord, who is accompanied by His associates, by performance of sakīrtana-yajña.” Other yajñas prescribed in the Vedic literatures are not easy to perform in this Age of Kali, but the sakīrtana-yajña is easy and sublime for all purposes, as recommended in Bhagavad-gītā also (9.14).

kṛṣṇa-vara tvia + akṛṣṇa

kṛṣṇa-vara means this Lord is in same category as Krishna

 tvia + akṛṣṇa, but His complexion is not like Krishna, it is different complexion

sāṅgopāṅgāstra-pāradam, sa + aga + upāṅga + astra-pāradam

aga, His limbs, upāṅga His sublimb, His astras all these are His Parsadam, so He has his associates with whom He comes

and what He do ?

yajñai sakīrtana-prāyair

So He teaches Sankirtan _Yajna

And su-medhasa

The intelligent people Medha is intelligent, su-medha is those who has good intelligence

Yajanti, they worship Him by performing Sankirtan Yajna.

 

So He has come and taught Sankirtan Yajna which we can perform and fulfill the purpose of Yajna.

So Here what is the point talked about again? The point is through Yajna our needs are fulfilled, Yajna is the way to harmonize with Supreme Lord. And Yajna is the means by which out material and spiritual needs will get fulfilled. So let is try to understand how this happens?

So it can refer to Brahmaji since he represents Lord and He is a secondary creator. Some Acharyas mentioned Brahma Ji but Prabhupada said it is Vishnu so there may be difference in details but essential principle remains the same.