How to issue Purchase order for a subscribed service and manage it in Service Desk Plus?

How to issue Purchase order for a subscribed service and manage it in Service Desk Plus?

Hello,
 
I have tested the "Purchase" section for products and it works well for business needs. What is the way to handle a PO for subscribed service? I'll provide the scenario as follows:
 
1. We need to subscribe to a new Internet Service Provider.
2. I can issue the PO to the service provider through the Purchase section but that item will be recorded as a product rather than a renewable service. e.g. Dedicated Internet Connection charges = 4000 will be recorded as a product rather than a renewable service.
3. I have also looked at the contracts section but it seems that these are for maintenance contracts only.
 
Is there any way to record and maintain a service Purchase order?
 
Thanks

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