Before requesting the connection with Booking.com, you will need to make sure that the rates you want to connect with the channel manager are set in XML in the portal.
Octorate will only be able to import rooms/rates created in that format.
How to check if a rate is in XML in Booking?
Non-xml rates are clearly marked with the "non-xml" tag in the calendar section of the portal extranet:
It is also necessary that in the "rate plans" section they appear with the wording "octorate mapping" and not with the price rule set in Booking.
If you don't know how to change your rates on the portals to put them in XML, then we will be able to import them and help you to complete the connection.