After you have made a commission agreement with a supplier on Bokun's Marketplace, you can book their products via own Bokun system.
Select "Bookings" > "Book: Experiences".
All the products that belong to you and your suppliers appear by default on your screen but you can filter them by suppliers. Selecting "Operator" on the right hand side of the screen brings up a drop-down menu where you can select your supplier.
You can book the selected product like your own products.