Best way add reload animation to existe walking animation

I want add many weapons with diferent weapons reload animations, what is best way do this if I already have walking animation?

regardless of what you have, the best way is definitely using Montages.

Each weapon can be made to indicate what montage to use, so any time you add a weapon and make a specific montage for it you won’t need to edit the characters blueprint.

thx reply, I want create this reload animation in Blender, so It enought to import from UE4 to Blender only idle animation and create reload move arms animation and after back to UE4 it will show in walk animation?sry bad english

possibly. I would suggest you go through the tutorial here.