Own Library of components

Hello, I am working in the simulation of an assembly system, I have different pieces to assemble, I want to have a library of pieces, like the ones in the ecatalog, I have tried importing the geometry, but I don’t get properties like width, height, or length. How to create the pieces to be available in the ecatalog?BaseComponent

You need to define the properties yourself. The properties can be anything but if you want to actually make parametric components that change shape when you change those properties then the geometry generally can’t be built from CAD models.
Parametric geometry can be built in different ways but not just imported from 3D CAD. See the “feature” related topics in help.