nope and the effort would be massive. if you want to have a proper pdms model you need to have a perfect mapping for everything.
i would not say that it is impossible but almost.
maybe as a obstruction model but that would not really help alot.
even easier converts like for example pds to pdms are already complex and alot of mapping work etc.
Actually I did it. All Piping and equipments with their spref. Although it depends on your Naviswork file and its data. Developing this code takes about 8 month ;)
And it takes about 3-4 week to convert all plant into E3D.
Way not. If you have a NWD created from PDMS/E3D with attributes I am sure you can write a software to convert the Model back to PDMS some how. But if you have just primitives or it is from Microstation or Autocad...i am not so sure...
Anyway - gut Job!