I would like to split a default object, have all its parts appear on the catalogue, then be able to use given object only when all its parts are assembled.

For example, I am able to split the Computer into three parts--base, screen, and CD respectively. However, I want the object to only function (or 'turn on' through the pie menu) when all its parts are combined (purchased through the catalogue and appear as assembled). Therefore, the computer will not operate unless the screen and CD are purchased as well. I know I need to use BHAV, but I don't know what code I'm looking for.

Thanks!