How do I create a button on a form that will save the current record, copy some of the fields to a new record, and redisplay the new record in edit mode?

Thank you!  I'm almost there..... I'm running into one problem.  I went with the high tech scenario option 1 - here is my formula:  

URLRoot() & "db/" & Dbid() & "?act=API_GenAddRecordForm"
& "&_fid_85=" & URLEncode([PO # (on PO form) - Lookup])
& "&_fid_23=" & URLEncode([Item Number (on ITEMS form) - Lookup])
& "&_fid_6=" & [Inspector]

Field 23 is not populating.  It's a look up field that relates the inspection back to the item being inspected.  Any idea why that isn't populating?  FID 85 is also a look up field and that one is populating correctly.  Could it have something to do with the relationship between those 2 fields?