How to add Extra Options in the Listing Booking Form

First check that Extra Options are selected to show in submit form from Admin > Theme Options > Payments & Submit > Listing Submit Page

Extra Options are added from Edit Property – Price Settings

Add in booking form other options. You can select

Option Name,
Option Value (fixed number) and
Option Calculation (fixed fee, by night/hour, by guest or by night/hour and guest)

You can add and delete these booking options as owner for each listing.

In Property page the booking form will show with the extra options