Yes what Jim said about 2 bars.
It might be easier doing it in a DAW.
Make sure you have the Ending bars set in the F5 > UserTracks Development settings.
This script will load a UserTrack template SGU into Reaper
Right click Save Link/Target As then Load script into Reaper
ReaTrak Biab SGU MGU.. to regions.lua

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Reaper-UT-Offset.png (129.21 KB, 122 downloads)