Tracing a created shape


I am an artist trying this program out to create templates for laser cutting sculptures I make.
Shapr3D is working great at creating the whole sculpture digitally, but I can’t seem to figure out how to copy an isolated face of the object I’m creating.

Is there a way to make a body from several shapes, then deconstruct the new body into its various constructed shapes - while they maintain their new dimensions/constraints ?

Thank you for you help!