I could be wrong, but I'm pretty sure you used to be able to control the suppression of a part in an assembly through an equation, I have been trying to do this with the version we're running currently (2024, SP5) but I can't get any variations of the equations from the older forums/ help.solidworks guides to function. 

Essentially I just need to be able to suppress a part/ parts when one of the global variables drops below a specified value.