Creating modified toolbar in Partial CUI

Having downloaded latest beta,
finding a new variant of the 'what do you want to do about migrating user data files' dialog, incl "Merge" (rather than "Update") the old and new CUIs,
but which nevertheless left me without the CUI (toolbar) customisations that I'd created ...
am trying now to do it the recommended way, by Partial CUI.

No prob with Customize>File>Create new partial CUI file, call it Tom's CUI.cui.
Now I want to create a version of the default Entity Properties toolbar, same as default but one extra tool.
Can Rclick on TOM'S CUI>Append toolbar. What next?
Do I have to create the new toolbar from scratch, or can I copy default Entity Properties into TOM'S CUI and just add the extra tool to it there?

Grabowski's Customizing Bricscad doesn't look hopeful:

"Create new partial CUI file ... (I would rather that this command creates a partial file of the selected item, such as a toolbar or a menu. The workaround is to copy and paste the items I want into the file. This is not, however, a great solution, considering that the CUI format is complex. )

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