I want to drill-down on a single category that contiains multiple column categories, but, with the current ExtLibs in 8.5.3 don't seem to be able to do this.

This seems like a very basic use case, but, haven't seen anyone try it.

I see the single category drill-down in MobileSamples.nsf, but, I want to be able to select a list of items from the first category, which drills down to the second categorized column, then, to the third, then to the document.

Also, the categories are configured "Show multiple values as separate entries".

I know you could probably create multiple doc collections and drill down that way, but, then you lose a lot of the functionality of the mobile lists, I believe.