I don't know if this option is offered on the North America side but on HomeAway.co.uk, we are and have been offered "multiple listing" if the accommodation are at the same address.
Traditionally it was a useful offer that allowed some $ savings with features which were very useful. All that has changed.
In the best days, all "units" could be viewed by clicking tabs at the top of the listing which would take you to that unit with its own information, pictures and calendar.
The tabs have been removed with a clickable "other properties" photo by this owner.
Now that is gone!
Problem is all units (3 in my case) have the same property number. Each listing does have a "unit" number but this number cannot be used on its own for a traveler.
So even if my listing says "3 vacation rentals..." a traveler will have no way of seeing each one without finding each in a search result.
Problem is each unit now have their own search metrics and now get separated often appearing on a different page instead of sticking together.
I recall it is within the rules for owners/managers the right to show their other accommodations on each listing so long as payment has been made for each listing.
I assume the "multiple listing" package (extra cost for each unit) falls under this rule so I should be able to show the other units by number on each of their listings.
Problem is the number in itself is useless... a whole URL is needed to find the other units on a HomeAway search. Not very traveler-friendly if they cannot simply click a link or picture instead having to "copy/paste" a URL in order to find those units.
Anyway I hope I am now allowed to describe all 3 of my accommodations in each unit descriptions with the URL but what a pain in the back.
Lucky that when I receive any inquiry asking about each units, I am able to include the URL in the response without it being redacted.
I am wondering why HomeAway is making things so complicated when things worked so well before. Maybe this "multi-listing" package is no longer worth the savings.
Purchase separate subscriptions?