Create variation of your parts using parameter-driven configurations, as part of Onshape's Parametric Modeling 2.0.
Whereas Old CAD systems manage configurations with a single, monstrous table and long lists of cryptic file names, Onshape's modern CAD system uses several smaller, easier-to-manage tables that accept multiple independent inputs, even variable numeric values. That means you can easily choose from an infinite number of variations of your complex configurations' dimensions and features.