of subfolders, not sure what that means.
M-m-m... excuse me my poor english. You can create subfolders in construct animations editor to pack bunches of animations.
I.e. isometric animations can have names like Run_0_degrees, Run_30_degrees, Run_60_degrees and so on. For convenience they can be sorted in subfolders with names Run, Idle, Shoot.
You can create loop with 30* step to set all animations to some fps. But on prototyping stage, where is need to setup slightly different animation speeds for only part of them, maybe not following one after another. Maybe I need to quickly setup 10 or 50 of them to be looped or not. If do this manually there will be faster to have bunch of construct projects instead of re-clicking them all.