From the Dashboard, in the My Organization section in top left of page, click the "Create Affiliates Organization" button.
In the "Create Affiliates Organization" modal enter the required information:
Name
Email
And the following optional information:
Description
Click "Create Affiliate Organization" button.
Whomever creates the Affiliate Organization is automatically added to the Administrator(s) for the Organization team and can now add users, create teams and projects.
NOTE: Affiliate Organizations will only be able to create local sets. Neither the reference set concept nor the reference set's members will be published.