If you are saying what I think you are saying, do you mean add the record number or something to the urls in a jump menu that is populated with live data? You make your pull-down menu and make it a jump menu. Then in the properties you choose to populate it with dynamic data. Thing is, you have to go in and manually change a couple of things to make it work.
The other choice would be a regular form post.
Either way, you'll want to set up a recordset on the target page to filter for the value of the form (POST) or query string/url (GET) variable.
I don't know if it'll help but I have something up at www.twebman.com/mm/dw/