Say I have a sequence called Sequence1.
Say I also have three sequences SubSeq1A, SubSeq1B, SubSeq1C which are laid out in Sequence1.
I modify the subsequences, and include many effects and transitions. To smooth out my editing process, I render the subsequences' frames and effects. This takes some time.
If I also render the frames and effects for Sequence1, will it take advantage of the work already done in pre-rendering SubSeq's 1A,1B, and 1C?
You are talking about "nesting".
Unfortunately, nested sequences still need re rendering and often it is forgotten in a saved project that this has been done when re opening the project.
Issue has been a bone of contention for ever and it never gets fixed.! ( Wouldnt even bother suggesting you send a feature request to Adobe because you would just be one in a very long queue)