How does one copy data from project to project in Doors Next Generation (without having the 'id's change)
One answer
No there is not - every server maintains its own counter in order to generate unique IDs. If you copy data from one to the other then it will create new artefacts, and they have to have new IDs or they might clash with the existing projects on that server.
The best way to copy requirements over but keep a reference to the old ID is ReqIF. There will be a ForeignID field generated that contains the original ID from the other server.
Be aware though that if you then use ReqIF to copy again, the ForeignID field will contain the ID of the 'new' old server, so if you need to preserve the original original IDs across multiple copies, you should copy them into your own custom field beforehand