Before you block tickets, you need categories.
Blocking unseated tickets
Unseated tickets can be blocked by clicking on ‘Add block’ within the category. Select your ticket and the number you want to block:
Blocking seated tickets
If you want to block seats, you go to the seating map. However, you will first have to enter the "blocking mode". To do this, click on the "Block" button under the tab 'Seating':
When you are in block modes, choose the category. If you don’t, your selected seats will be uncategorised:
Select the seats you want to block by clicking or drag an entire row in one go. The seats turn black. You can block min-multiple categories in one attempt. Adjust the category, and the following seats will be placed in the newly selected category.
If the blocks are as desired, click on the bottom right on confirm. After confirmation, the seats will get a small lock in the corner.
If you look at the map, you will see the first three letters of the note in the blocked seat. If you hover over the blocked seats, you can read the name on the ticket.