Problem It is often found that for some projects some customized toolbars are needed which was needed for any project. But for some reason, if the Pref folder gets deleted or software needed a reinstallation those customized toolbars is getting lost.
Steps to Accomplish
To store these things beforehand you need to store some files from the existing pref folder (which generally lies in the path C:\Users\User.Name\AppData\Local\Bentley\OpenBuildingsDesigner\10.0.0\prefs). Here on the screenshot, the needed files are being marked.
Move Ribbon Customizations to new GUI DGNLib