License types can not be mixed on the same server - you are either user or application based.

You can always add more users (or applications) to a specific license as your needs expand.

Order processing will be the same - you contact your source of product and order what you need,

Adding users or applications to an existing license will be the same kind of process. You would order xx additional users (or applications) for serial number yyyy and get a new registration code for that server that includes the expanded capabilities.