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If your Dgnlib is defined in MS_GUIDGNLIBLIST variable and you open Customize Ribbon, select Menu Customizations in the combo box labels "Choose components from" and you should see your custom menu items. You can then drag these items into the ribbon as buttons.
See images below
Please have a look at the video below if you want to create a customized ribbon from the scratch:
You can also open any DGNLIB that is in the MS_GUIDGNLIBLIST, and any customizations will be stored in that DGNLIB file. The DGNLIB where the customizations are stored is shown in the title bar of the "Customize Ribbon" dialog.
https://communities.bentley.com/products/microstation/w/microstation__wiki/25797.how-to-migrate-old-customizations-to-the-ribbon