Your sites now live in Sites & Pricing. The old Sites page under Reservation Setup was removed, and old links to it take you to the Sites tab.
Go to Revenue Management → Sites & Pricing and open the Sites tab.
*Please note: if a new site needs a pricing tier you don't have yet, create the pricing tier first in the Pricing tab, then add the site.
Open the three dots at the end of the site's row and choose Edit Details. It's one form with sections you can open and close: Name & type, Pricing, Specifications, Occupancy & details and Guest info. Change what you need and press Save.
Open the site's row menu and choose Duplicate Site. The form opens filled in with the original's information. Give it a name and press Create.
Open the site's row menu and choose Archive. Archived sites are hidden from the list; turn on Show archived sites to see them, and choose Unarchive from their row menu to bring them back. Its history is kept.
Tick the sites, choose an action from Bulk actions (mark as available or unavailable online, archive, unarchive) and press Apply.
For the full guide, see Sites & Pricing.