Question: Hi Tien, this Revit file is worked on by many people, and they imported multi-CAD Files. How do I remove all the duplicate items?
Answer: Make sure that CAD File is not located anywhere in your project. Please follow these steps to remove unused imported CAD Files
Step 1: Go to Manage --> Select Purge Unused
Step 2: Find the dwg name
Step 3: Select Check None (because this Revit file is still working, I don't want to remove your working families). Then select the CAD Files that you need to remove.
Result: Check your result, the checked CAD Files are removed!
Hope this helps!
Please contact me if you need any further information
@Tien - Nov 15th, 2022