This may be a silly question about a poor UI design, but: can you have a Popover open from another Popover?
I’ve never seen such a thing. Popovers are somewhat transient elements. Clicking outside of them causes them to close. If there was a second any clicking in it would be outside of the first, causing a cascade of closures.
What about embedding a page or tab panel within the popover, you could then how multiple pages, which perhaps could serve your needs?
What are you imagining?
1 Like
I decided it was a bad idea. 
I switched the first Popover to a sheet window - which I was not aware would function properly on a globally floating window! Works great.