Yeah, I agree with everything been said before. But it doesn’t hurt to ask… I had luck several times that the EuroBonus agent added a short haul segment to my longhaul reservation.
Last time even on a *A ticket with LH F. Was booked HAM-MUC-SFO-MUC-HAM and the agent added CPH- and -CPH to the ticket. For free, no chance fee or anything.
Didn’t thought that to be possible… but obviously it is.
And yes… I took those flights and all worked out fine