(2016-08-18, 16:37)Philippe Hurbain Wrote: Well, I don't know if this answers exactly your question, but in LDCad you may create a submodel from parts in the main model using this method:
- select all the parts you want to move to submodel
- right click -> reorganize -> move to subfile
Also if the original LDD model has been constructed one submodule at a time, chances are high the part order is the same in the ldr. If so you could use the source window to select blocks of parts much faster.