How do i show in booking.com that i host 2 rooms in the same property, which i had already listed separately, 4 months apart

I registered 2 studio rooms 4 months apart but did not know at that time that it can be shown together if the address is the same.  I saw some properties in the platform the listed the whole house, but then is renting/booking each room out as separate units with different rates and amenities (but in the same property/house) .  

How can i do that for my 2 separate listings (now that they've both gone live, one went live in May 2022, the 2nd unit went live just 2 weeks ago in August week 3)