Allow "External Copy of Geometry" feature to reference multiple components

[fnefli]

Hello,

Can you please allow External copies of geometry (ECG) to reference multiple components?

Current behavior makes for very large squeletons with multiple ECG pointing at differents components/parts.

Allowing ECG to use multiple models will decrease the modeltree length..., decrease the number of clic necessary to build the skeletons... etc

Thanks in advance