@Keerthi0 If you have seven seperate rooms that you sometimes rent out individually, then you need SEVEN seperate listings (or more, if you sometimes rent 2, 3, 4, 5, 6, or 7 rooms altogether). If you don't create multiple individual listings, what you're going to find out is that after you rent out any one of the rooms, all the rest of your listing will be shown as blocked (unavailable) on your calendar, and you'll be unable the rent out any more of your rooms.
If you don't understand what I'm saying, feel free to send me a private message and I'll explain further (with probably a 24 hour or so delay).