Creating your own EpiDataView for this seems like a bad idea. This specific screen the UD100 is based on an EpiTransaction style called Multi-View vs Single View. Like the UD01 (which do allow multiple parents)
You could create your own EpiDataView but I think the form itself won’t let you pull in more than one UD100 record at a time.
You are going to have to write it all yourself which seems like a lot of work… It’s doable… but yuck