Copying References from Drawing to Drawing

I am unaware of anyway to Copy and Paste reference files from one DGN file to another. I think you may have two options.
Option 1, You would have to Make a Copy of the original file by using Save As Command. This will save the file and reference files as is, then you will need to delete all the unwanted information from the Active file leaving you with all the reference files still attached.
Option 2, Create a blank new dgn file and attach the master file with all the reference files desired. In the reference manager, select the nested reference file, go to setting and copy reference attachment to new active file. After you have done this for all the reference files you can detach the original master file.
Hope this helps.

Oh - Ok - I see where you are going with this. Option 2 - you can make the nested references "direct" attachments.
and a third option would be, that after you create the new blank file with the needed attachments, use this as a seed file for any future files that need to be created.

Oh - Ok - I see where you are going with this. Option 2 - you can make the nested references "direct" attachments.
and a third option would be, that after you create the new blank file with the needed attachments, use this as a seed file for any future files that need to be created.

Be careful with Option 2! The files may have differences if different seed files were used to create the files. Best option is Option 1. Just create a file using Save As, or just copy the original. That way the files are identical.

Either way - I would at that point, take that file and use it as a seed for future files (but as George states, make sure it is exactly what you need first).