A multilevel dropdown component.
How many levels deep is it?
Do you have a mock up of how you’d like it to look?
If it’s a complex layout it’ll need a little thought, since the dropdown component is just for single level lists. But anything is doable…
My initial thinking might be - if it’s only a few levels deep you could have a few dropdown components. Depending on the structure the higher level values could be updated based on the lower levels selected…
If clutter is a problem then you could do the selection on its own form or in a (large) alert rather than on the same form that displays the data.