You can apply a limit on the number of enrolled devices to an organization group (OG). Imposing such a limit helps you manage your deployment by preventing you from exceeding the number of valid enrollments.
This device limit can be placed on any type of OG (global, customer, partner). Once a limit is set at one OG, you are unable to set another limit anywhere in the same OG branch. You can set another enrolled device limit but only if you are setting it in a separate OG branch.