can you add an "extension" to a metamark link?

For example, I am using Metamark for affiliate links and I would like to add (for example) "/?tid=GOOGLE1" to the end of it and have the true link plus the extension as the expanded link.

e.g.

xrl.us/affiliate1 -> www.rc.affiliate1.hoplink.clickbank.com

xrl.us/affiliate1/?tid=TEST -> www.rc.affiliate1.hoplink.clickbank.c...

Hope you can make sense of that.

Thanks.

richard@charrington.net