See the instructions for creating a seating chart for your venue below
Select the venue from the Venue tab on the left
Click Seating Charts
Click Add Seating Chart
Follow the instructions to drag and drop or create sections, rows, areas, etc.
Once a seating chart is published to the3 venue, you will be able to select the seating chart for the venue in the event creator.
NOTE - Sections, rows, areas, etc. will be locked to the parameters set in the seating chart.