Digital Anatomy Creator

I have encountered times where I import an assembly into grabcad - for simplicity, lets use a wrist as an example - and then proceed to set up the model. Then I realize I would like to swap out a wrist bone with another version of the same bone (perhaps I have better cleaned it up). There is no way right now for me to replace that wrist bone, I have to remove the entire assembly and reimport the entire assembly (and redo all materials settings).

A similar example would be that I realize I need the distal ulna in the wrist assembly. There is no way for me to add a single part to an existing assembly (and align it to the original coordinate system).

It would be great if GrabCAD could consider this feature.