If you have an agreement with an employer that they will pay a flat fee regardless of how many employees are enrolled, you can follow the steps below to set up their plan.
Navigate to 'Admin' --> 'Employers'
Click on the tab for 'Employers Plans'
Click '+ New Plan'
Name the plan and make sure to select 'Fixed fee' as the plan type
Click 'Create New Plan'
As with all other plans, you can select if you'd like the billing period to be monthly, annual, semi-annual, or quarterly
Set the amount that should be billed each billing period
Scroll to the bottom and click 'Save Plan'
You can then continue with these directions for setting up a new employer or adding this plan to an existing employer.