how do i connect a crest audio X VCA to a steinberg UR22 audio interface with a behringer headphone amp , to then record the input from the mixer into my DAW and get the sound out of the mixer again so i can have the sound of the DAW coming from my monitors .
The UR22 has no line level inputs. Those would be where the mixer would connect to the the UR22.
You may be able to connect the mixer and headphone amp directly to the PC. The mixer output would be balanced so you would need balanced inputs or convert to unbalanced.