Step 1: Log into the Platform as an Admin
Step 2: Access the Markups Tab, and through it, the Markup Builder:
Image 1. - Markup Builder Location
Step 3: Choose the Segment for which the Markup will apply (Air, Car, Hotel and Per Booking)
Image 2. - Markup Segment Selection
In order to learn more about each individual option available for each Markup Segment, please refer to the Air Markups, Car Markups and Hotel Markups Documentation.