I am currently speedrunning the any% category and I want to know if I can use my individual level runs as my best segments on Livesplit

For most levels in a fullgame run there is a difference between the individual level time and the full file time taken, due to load in cutscenes/end cutscenes which count towards file time but not IL time. There is a list of these times https://media.discordapp.net/attachments/672552986811301889/841444803799547946/unknown.png, though personally I think having a separate set of bests for fullgame helps figure out what levels need work when you can’t reset any mistake.

of course your splits organisation doesn't affect the run's validation in any way