When you create a form for players to register against, you can also set up grades. When people register, you can place them in the appropriate grade and then into an appropriate team using TeamBuilder.
Hierarchy: Form > Grades > Teams
To add grades to a form go to Dashboard > Online Registrations > and then click the edit pencil icon of the form (see How to edit a form).
Click Add Grades.
Type the grade's name into the text box, and click Add Grade. Repeat this step until you've added all of your grades.
You'll notice once creating a few grades you can change their order by clicking the move icon and dragging them up or down the list, and also remove them using the Remove button.
When you're done adding grades, click Close.
Your added grades will appear below Add Grades. Tick the grades to activate them.
Click Save Form.
Your grades have now been added, and will be available to create teams in TeamBuilder.