Pick a good header event (like column post validate on PromotedDate), and add a line loop in that header script...

Set oLines = oSession.AsObject(oBusObj.Lines)

retVal = oLines.MoveFirst()

do until oLines.EoF

' do stuff…

retVal = oLines.MoveNext()

loop ' oLines

thanks for the reply, is there a way to trigger an existing script, i dont want to rewrite the entire script again on the header.

this happens quite often when we make changes to a script on the detail and need it to update for older quotes that will be converting to orders, i want to know if there is possibly to just trigger the other script without rewriting it on the header. (so any changes to the detail script will not have to be updated every time in the header script as well)

Add a checkbox UDF to the detail table, and attached a second event trigger for the same script to that field.  (You don't want to change the ItemCode, and this extra field is just for the trigger). 

Then, as your "do stuff": change the UDF (Y>N or N>Y), which triggers the line script, then Write(),.. MoveNext()...

That makes sense, thanks again