How can I delete unused shared cell definitions in my design file?
Key-in "delete scdefs all" and press Enter to delete all unused shared cell definitions present in the design fileor navigate to File > Tools > Compress Options, toggle "Unused Cell Definitions" to ON, and then select Compress to delete all unused cell definitions.
More info on Shared Cells in MicroStation CONNECT can be found within the online help documentation:https://docs.bentley.com/LiveContent/web/MicroStation%20Help-v17/en/GUID-6B18AF53-C01E-2D58-971C-C2AD1B7BE502.html