Ben Wolf November 11, 2010
At the top of the home page click Settings.

Click to view the Subreview Labels tab, then click Add New.

Choose a Name and Abbreviation for your Subreview, assign a color, and click Create.

Users with Reviewer accounts can only access documents in Subreviews that they have been assigned to. Click assign to add users to a Subreview. You can also edit or delete a Subreview label here.

Click on the green icon to add a user. Users already added have a red icon, which you may click to remove them. When you are all set, click Done.

There is no limit to the amount of Subreviews you can create. The video called Labels and Issues is helpful in guiding you through the process. Check out our blog post about this.
This functionality is available for Advanced and Standard users only.