The best way to limit Apps & Books applications to a subset of devices is to:
Create a Child Policy
1. Click Policies in the navigation bar.
2. Click + Create Policy
3. Name the Child Policy.
4. Select the Policy that will serve as the Parent.
5. Click Create.
Move the desired devices into the Child Policy
6. Select the newly created Child Policy.
7. Select the Child Policy's Devices.
8. Using the dropdown-menu change is so that the Parent policy or All Policies is selected.
9. Select all the devices you want to move to the child policy (selected devices will have a dark checkmark on the leftmost column).
10. Click Assign to, in order to move checked devices to the child policy.
Now, all that needs to be done is to set an Automated Device Enrollment token for that child policy.
You're all set! If you experience any issues, please reach out to the Addigy Support team by email firstname.lastname@example.org.