Can I create a quantity based on credit for usage?

No, you can't create quantities based on credit for usage. However, you might be able to use the Credit Memo Option field on the Subscription Profile page to automatically create on-account credit memos during closure or amendment of subscriptions.

The Credit Memo Option field has these values:

• On-Invoice: The application creates a credit memo that refers to the subscription bill line invoice, irrespective of whether invoice is paid or not.
• On-Account: The application creates an on-account credit memo, irrespective of whether the invoice is paid or not.
• Mixed: The application creates a credit memo that refers to the subscription bill line invoice if the invoice isn't paid. Or, it creates an on-account credit memo if the invoice has been paid.

The application checks whether the invoice impacted by amendment or closure has been paid in full or not. It then creates a credit memo based on the Credit Memo Option field value.

You can issue on-account credit memos from Subscription Management based on the subscription profile. This lets you preferentially create on-account credit memos and credit memos against invoices based on whether an invoice is paid in full.