Adding a detail view of a created viewport?

I’ve been experimenting with clipping planes and different viewports. I’ve found that you can create clipping planes to create sections such that they only show up in this new viewport that has been created. This feature is nice, but when I try to add a detail view to a layout it does not give me the option to select my custom viewport to insert or change it to. Anyone have any ideas?

Thank you!

Hello - I do not follow… what exactly are you trying to do?
-Pascal