Combos are store in the “DT_Combos” data table
In AACS combos the approach for combo selection is either Combo Branching or Simple Combos . The option for this is called “UseComboBranching” in the BPC_CombatSystem
component in your character.
Combo branching can be more performance expensive if you have a very high number of combos (more than 30 or so), or if there are a very high number of AIs using combo branching at the same time. So combo branching is disabled by default for AIs, and enabled just for the player.
For finishers check Animation Syncs