I have the Alaska Air award booked on LATAM metal and wanted to add an extra leg to my reservation. I can make a seperate cash fare of course but I am trying to avoid having to pick my bags up in Lima and recheck back domestically in Lima to Cusco.

Route currently is ATL-LIM and is ticketed.
Requested route ATL-LIM (award on Alaska/LATAM) - Cusco (would want to do a cash LATAM metal fare)

Would LATAM be able to combine these reservations into ONE ticket so my bags transfer through to Cusco or will LATAM not touch an Alaska Reward booking? I have a LATAM reservation number.

THX!