Can I edit an animation file with parts from other animation files?

Hi,

I’m using AnimStarterPack to create a TPS with AimOffset.

The problem is that my IDLE animation has the weapon on the HIP, while the WALKING animation has the rifle upwards (ironsight). And I want to walk while the weapon still on the hip, just like my IDLE animation from the spine because there is no “Walk_rifle_hip” animation.

Is it possible to use this walking animation from the waist down while using the upper part of another (weapon on hip) animation at all times when I walk?

I’m really new to this, so yeah, I need help.

Thanks in advance!