My BLT and SSR are under the same UY so I usually will combine points at 7 months and stay at one or the other on alternating years. If I want to book an extremely busy time I may book a split stay. I try to borrow heavily from one or the other when I book, so I don't have banked points in multiple contracts. BRV is a different UY so I either split stay, or just go on a short trip with it.