How do I use 2 animations at the same time?

How do I use two animations or more at the same time.

At the picture you can see that I am using firebreathing1 which doesn’t walk. And you can see walk which makes the walking animation.
I’ve setted something and now both animations are combined together.

I want to have this now when I am doing: [“stand_fist_aim_walk”] I want that I use those 2 animations like I made at the view model. (Also if I use 3)

But I don’t know how to do this.

Can you help me, please?