how can i create a megaroom ? i dont know anymore what to write in hotel

hi can someone help me out to get a very big room in hotel ?

i have boost cms
r63
GTE

i remember 1 thing that is :bigroom but that was in another hotel .
i have seen the bigrooms in my hotel but i dont know how to get those for my self .

here is a screen then you wil know what im try to explain .

its this 1 in room models model_big_1
but how do i add them to the hotel room to buy the room ?

dont know what is so funny ?

but yes have the codes already