When you set up a new rate on the booking engine, you can add the description and the relevant cancellation policy then map it.
The next important step is setting up the extra adult of child rate if this is applicable. This only pushes to the booking engine. It does not push to any OTAs (online travel agents).
When you map a new rate, the field for applicable guests pops up and you can set it up.
If you need to adjust it, simply click edit. See screenshots below
NOTE: The extra guest rate set up on the Preno Rates page does not push to the booking engine. It must be set on the booking engine itself.
Here is short video