原始问题：
How to export part of DGN files into a new DGN file?
- Open the DGN file in MicroStation.
- Select the elements you want to export and use the “Copy” command to copy them to the clipboard.
- Create a new DGN file and open it in MicroStation.
- Use the “Paste” command to paste the elements from the clipboard into the new DGN file.
- Save your new DGN file with a different name or location so that it does not overwrite your original DGN file.
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