I need a formula that will open an alternate version of a form to populate a field, save, and then edit a couple of fields on the full form.

I have an app in the Exchange called URL Formulas for dummies which explains one way to nest formula URLS.

Note: formula URLs and not formula Rich Text fields.

Define your steps and then nest them like this.

Define each step as a separate formula variable, in order to improve readability. Then just slice off as much of this salamiI as you need.

$URLONE
& "&rdr=" & URLEncode($URLTWO)
& URLEncode("&rdr=" & URLEncode($URLTHREE))
& URLEncode(URLEncode("&rdr=" & URLEncode($URLFOUR)))
& URLEncode(URLEncode(URLEncode("&rdr=" & URLEncode($URLFIVE))))
& URLEncode(URLEncode(URLEncode(URLEncode("&rdr=" & URLEncode($URLSIX)))))
& URLEncode(URLEncode(URLEncode(URLEncode(URLEncode("&rdr=" & URLEncode($URLSEVEN))))))