Subscription Billing Software Resources

We sell a service to our customers, which requires the purchase of a license from a vendor. Since this is a service, we need a project creation to minor the progress and resource utilization. Hence we used service for the resale item to create the project as well as the drop-ship purchase order from that. However, NetSuite does not support creating drop-ship purchase orders for service for resale items. As a workaround, we created a custom field in the purchase order and maintain the related dales order URL there manually for now to maintain the relationship. But we want the drop-ship PO creation to be automated. Is any workaround available to overcome this problem?

Looking at alternatives to salesforce as a platform for our contingent workforce platform and curious if Netsuite is module based similar to Salesforce allowing us to bolt on modules to build out capabilities.