To add a "Place Holder" team, you will need to create the team in your organization account and register that team to your event.
Click the "Club Management" tab on your left menu, and click "Teams". Create your team by clicking the "New Team" button.
After you create your team, click the "Registration" button at the top, and click "Register" next to your event.
Click the checkbox next to the team you are enrolling, then click the "Register" button and select the "Selected Team" (checked off team) option.
Go back to your event and click "Scheduling" -> "Divisions". Click "Add Team" to add that "place holder" team to your division.
You will now see that team in your division.