How to "inline" a sub-model?

[Roland Melkert]

To do this, I need to get the models into the same file. Each model is an MPD with many nested submodels.

You could easily do that by using the nesting mode in my LDCad.

Open the top level model, and put it in nesting mode ('n'). Then select all (ctrl+a) and copy (ctrl+c). A dialog might ask for some options regarding origin corrections and stepping etc. The whole model tree will be reduced to flattened library part references (could take a few seconds) you can paste in e.g. notepad or a new model.

edit: I'm assuming the model tree does not use embedded parts though, only official / unofficial filebased parts.