I've created an assembly containg four parts, that are all mated together so that it holds a desk which is fixed onto a leg. The desk then tips up and out. It works perfectly in it's first assembly. I then add it into another assembly where it gets fixed onto a seat. The first assembly now doesn't move i.e. open or close. I have to go back to the other assembly to then move it to a desired position.

Is there anyway of creating assemblies that have mates that will then translate into the new assembly and not be 'solid and unmovable'

Thanks,