How To Merged Looped QueryTask

I am having issues merging mutltiple featuresets into a single feature set. Here my workflow as it stands:

1. User selects one or more Districts from a ListBox

2. I have a ForEach loop that runs a QueryTask to rerturn only the ObjectIDs (needed for Relationship Query Task)

I am having an issue merging those featuresets from the ForEach loop into a single featureset, collection, list, you name it, I've tried it.

Ultimately, I need a list ObjectIDs that I can pass thru to a Relationship Query Task to return additional information about culverts.

I've a tried a Parallel For Each Loop: Failed. I've tried a For Each Loop inside a Parallel activity: Failed.

Am I missing something?

Thanks in advance!

GE 4.6.2

GV HTML5 2.7.1

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