Form 770 is a VA form for final year of a Trust. Did you go through the VA interview?
1) Open Forms
2) Click on Virginia Fiduciary Income Tax Return
3) Click on Form 770 and the dropdown will appear
The information on the Virginia 770 is primarily going to be entered through the federal K-1 entry. The stuff that goes in separately is the items in two and three. You'll enter those as additions and subtractions from income into the Virginia return where appropriate.