I'm currently facing this issue. Probably I forgot to check something...
Basically I need to import a found set in Table A (Order details) into Table B (Warehouse operations) in the same file.
Now, I set a script that set the found set with a 'Go To Related Records' in the Source Table, Then I Open a New Window and Go to Layout (destination) where I want to copy the found set.
Then Import Records from TO (Table A, where is the Found Set). And it takes all the records, not the found set.
I did it even manually but I allways get all records.
Can someone help me debugging it?