Import geometry regen

ZW3D CAD
#1

Working with the mold module, in this case I print multi-object.
I had to re-edit the division of each piece. Then the “combine” file, which is the one that combines the divisions of the two pieces in a single file, was updated (I had to force it) but anyway I got the two finishes of the cavity and core. (They are surfaces and not solid because I have gaps to close, but they were before).
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Subsequently ZW rightly tells me that the trim sets also need to be updated. So I decide to update the core.
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But in updating it lost the reference of the imported geometry.
How can I re-edit this connection?
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I think about connection management but this part is not very clear to me
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Thanks

#2

Good practice would be to correct the imported geometry as the first step in a new part.
Then bring this new part into the model. That isolates the repair process and should also reduce the effort to get a good separation.

Cheers- Paul