Background Ribbon Customizations are stored in DGNLib files, they may be stored in the user's Personal. dgnlib, or in a configured DGNLib file as pointed to be the variable MS_GUIDGNLIBLIST.
Steps to Accomplish
Below is the workflow that needs to be followed in order to move Ribbon Customizations from one GUI DGNLib file to another
The first step is to open the file containing the Ribbon Customizations that you wish to move. The MS_GUIDGNLIBLIST variable will help you to find possible locations if not aware. By default, it’s saved in your Personal.OpenBuildingsDesigner.dgnlib under this location C:\Users\USER_NAME\AppData\Local\Bentley\OpenBuildingsDesigner\10.0.0\Prefs
Note: Optionally, you can remove all the existing ribbon customizations before importing the ECXml file by using the key-in RIBBON CUSTOMIZATIONS REVERTALL.
Alternatively use the tools within the Customize Ribbon dialog to Revert selected ribbon items or all.