Turns out getting the selections to a repeating table was quite easy. All I had to do was drag the repeating field to another section and choose repeating table. (I'm always trying to make things more complicated than necessary...aye.)
What I am really stuck with is the look-up part once I have retrieved those values.
I want to use the same secondary data source that populated the list box as a repeating table within that repeating table, and filter or hide rows where the IDs do not match. I have googled and searched this forum for days, and am not having any luck with anything but almost-solutions.
I have found how to have the repeating table within the repeating table populate on one entry, but not on more than one, but only was able to do that when I was having the user populate the first field manually.
Here is a simplified version of what I am trying to do:
My fields:
My other thought if I cannot get the nested repeated table part down was to try to write the values from the MSLB to a series of text fields where I would simply hide any un-used text fields.
I was able to create a single text box and use a double eval with concat to find the selected values, and thought from there I could find a way to parce out each individual entry to its own text box, but I just don't have enough working knowledge of text functions to get very far down that road, either. I have a feeling I'm simply trying to take on a bit too much with my limited knowledge, but, well, that's kind of my style....