How do i make a hold / shooting animation with another animation such as walking?

Never really done any sort of animation so i was wondering how i would have a shooting animation while a player was walking?, would i need a entire shooting&walking animation for that? or is there a easier way to do something like this

Use animation priorities, set the animation priority to action for holding and action2 for shooting and it will overlay the animations, no need for a walking&shooting animation.