How to extract Gain/Loss from Inventory Views:

For unrealized Gain/Loss :

Step 1: Go to inventory view dashboard
Step 2: Filter to your specific DATE.
Step 3: Ensure that the inventory view reveals GREEN i.e. not Red or orange
Step 4: Right on the dashboard you should see a column for FMV and a column for unrealized gains
Step 5: Download summary
Step 6: Sum up the unrealized column in excel

For realised Gain/Loss:

Step 1: Go to inventory views
Step 2: Click on Report ( right next to lots option )
Step 3: Click on cost basis roll forward
Step 4: Select date range
Step 5: Hit run report.