Check out 1b of the FAQ's 'Common formula examples' by Ken Hamady. Although I haven't used that specific formula, I have tried quite a few of his and found them easy to follow and they work!
Heres the way round that I found working with ?paramx for the example...
1) Set for each ?paramx a formula field to point to ?paramx (@formulax for example)
{?paramx}
2) Change subreport links. Choose each @formulax field deselecting 'select data in subreport based on field:' for each
3)Edit...
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