This sample is a PREVIEW of what is coming in 23.4, but available now as a non-production hotfix for 23.2, to partners and by approval to customers. It will be a sample in 23.4 GA.
-Adding Submenus and widgets to Properties menu in D2 SV - Ability to create custom panels in the object metadata view
We can't add mp4's here, so here is a Core Share link
(partners have access to the root folder of this, but here is a direct link to this one. If a customer needs this pre-23.4 for non-production, please contact me. In 23.4, this ability will be GA.)
https://core.opentext.com/pdfjs/web/viewer.html?shortLink=94af5ce59e4802a2a1ba9cdbeb60b53d26f0e8376af47186