You cannot create Site Groups unless the site groups feature has been turned on. See Enabling site groups.
Note: Only System Administrators can create site groups. If you are a Site Group Administrator, you will not be able to create site groups and must speak to the overall System Administrator for the ACTIVE Content Manager.
From the System menu, select Site Groups.
Click the Add Site Group button.
Make sure the Active checkbox is checked.
Complete the Site Group Details and click Save.
Complete the settings on the Permission tab.
The Sites tab allows you to indicate which sites will belong to the new site group.
Edit emails as desired on the Email tab.
Click Save. You can now create sites to add to this new Site Group (or add existing sites).