Parent, Child relationship - create collection with the children as one variable using concat?

[sasrsc]

I've been working on this for hours and I think I'm getting further away from solving it...

I want to do a ForAll and loop through each Report by Name in the Table VAReportListings and add a column to a collection that is a concatenated list of the TagID.Name value from VAReportTags. It's a zero-to-many relationships. 

So for example:
Airline Analysis, Air-Trip-Events
Arrivals & Departures, Air
Bookers & Travelers, blank currently
etc...

The ListID and the TagID in VAReportTags are lookup columns in CDS and is displaying below the "name" value.

Table VAReportTags

Table VAReportListings