No you can’t do that. I didn’t pick up on the fact 1 was a cash booking.
If I was @Bubblez I would see if I could change the cash room to a studio and request they be at least near each other. Then one can be the sleep / work area and you have the 1-bed to socialise in.
I’ll try and explain this as best I can. Bear with me. And I’m “thinking aloud” as it were.
You want to achieve splitting the points stay into two. One for as long as you would have points for if it were a 2-bed, and one for the rest.
But this means gambling somewhat, as you’d need to see if the 1-bed was available for the shorter stay, modify the existing stay down and immediately book the remainder as a separate reservation using DH’s name as the lead guest.
Then you waitlist the 2-bed to replace the appropriate 1-bed stay but also dropping the other one so you actually have enough points.
And then adjust the cash booking to only be for the length you need it for to make up the 2 weeks.
And personally I would have the 2-bed at the end.
Does that make sense?
However it is risky and a real palaver to do. And you would need to change rooms too.