Follow these configuration to allow author add Rooms into their listing
Edit listing type post to select Hotel Room for child post type option then click Save Changes
Add/edit room submit fields
You also need add Calendar field to change room’s available dates
Add Listing Rooms field on listing submit/edit page
Then author can add/edit rooms for their listing
Please make sure that room must have quantity and person fields
And to show rooms on single listing page. Edit listing type post -> Single tab -> Listing sub-tab to add Hotel Rooms element into layout builder.
And this is how rooms showing on listing page
Edit room details page
Set Hotel Room Dates for Dates from option of Availability Calendar element on listing page to show available dates for booking ( dates from the room calendars )
