PBS Bidding Question: I usually bid reserve, but thinking of line for next month and not too well versed bidding for line trips.

My category picked up a bunch of nice Carribbean layovers for January. If I can score a couple of those, I'd deal with flying a line for the month, otherwise I want reserve. Basically, I want to bid in such a way that I get at least a couple of the XYZ layovers and if not awarded "else start next" and give me reserve.

ELSE START NEXT doesn't seem to be an option to combine with AWARD PAIRINGS. Any ideas how to construct a bid with this logic? I'm looking at adding a CSSN line, but I still think it might possibly award me a line without the XYZ layover if I use this.