Crystal Reports Passing parameter by URL between reports

Message

     Hello,
I have one report with a cross-tab inside and for each cross-tab row I have one link to another report.
I would like to pass the row-desc as a parameter to a second report.

Now, what I've done so far is to go to the hyperlink section and set the URL as this:

shared stringvar url:= http://.....

and this works fine, as the second report gets opened.

What I tried to do is to concat a sort of query string  to the URL  as follows:

url := url + "productDesc="+ URLEncode (CurrentFieldValue);

and this seems to works, because I get the correct values for productDesc for each row of my crosstab.

Now, how can I access the values for my param(productDesc) from the second report and therefore how I can link this parameter to my report field?
Can I perform the same things easier using subreport?If yes, how?

Note(don't know if this is important): both reports came out from a parametric SQL

Thank you in advance