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After the GTRR:
Enter find mode
Constrain the found set instead of performing the find
Put your GTTR button inside the row of a portal. Specify a portal filter that filters just for the data you want on the other end of the GTRR. The portal filter will constrain the found set for you.
With large numbers of related records, I suspect that 1 can be faster than 2, but YMMV.