To create a segregated fixture, there are two parts: creating the fixture and assigning the tickets.
Firstly, you need to create your fixture, the article linked will tell you how to do that.
Once your fixture is created, you want to create ticket types for your areas (How to create a ticket).
You are wanting to create tickets for each area, and then within each area your types as shown below:
Repeat this for each area you want to sell tickets for, labelling the away tickets as such in the ticket name.
Once you have your tickets set up, you have to assign them to the fixture.
When assigning home and away tickets, ensure you assign the home tickets first, as this will mean the home tickets will appear first for fans.
The final step is to share the link for fans to purchase. You can do this by selecting "share" at the top right of the fixture screen.
Planning to have separate entrances for Home and Away fans?
Check out how you can set this up on the ‘How to set up scanners to scan for different areas’ article.