Yes, you can purchase the licenses in the quantities that you need.
So if you had 6 access points, you would purchase a quantity of 6 LIC-ENT.
Aruba changed their licensing policy some time ago, so purchasing the LIC-ENT does not give you any cost savings. The LIC-ENT just makes it easier and cleaner when ordering.
So instead of having a line item on your Bill Of Material (BOM) for:
6 - LIC-AP - $75 each
6 - LIC-PEF - $75 each
6 - LIC-RFP - $75 each
6 - LIC-AW - $75 each
You can have:
6 - LIC-ENT - $300 each
In the past, Aruba used to offer small discounts if you ordered the licenses in certain quantities. Those days are over.
***Disclaimer*** This is based off of the October 2016 price list on the old Aruba Partner portal. The HPe portal may show different part numbers, pricing, etc.