Custom tours are tours based on the activities you already have created in your account. When booking them, you will be able to set a different price and capacity if needed.
STEP 1: Go to the activities over and scroll down to the activity you want to book. Click on the arrow and select "Create custom booking"
STEP 2: Select the type of schedule you want for this booking.
STEP 3: Enter details for the custom booking
STEP 4: Select "Add Gust" to add customer information
STEP 5: Click on "Add to basket" at the bottom of the page. Then, complete the booking as usual.