To add a select screen variant in a transport order, use program (SE38) : RSTRANSP.
You can also do it directly on your report :
SE80 : Set your program name (stay on 1st screen).
Menu -> Goto -> Transport.
Utilities -> Transport management
Set your variant name and click Execute (or press F8) to select your transport order.
Check the screenshots here : https://wiki.scn.sap.com/wiki/display/ABAP/Transporting+Select+Screen+Variant
Search tag: OT, variante, transporter
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