Extract Payment Schedule from Quotes

I am looking for a way to track the payment schedules of our customers who are signing up through HubSpot Quote. Our draw structure for some of the projects can get complicated and get scheduled at the completion of milestone as opposed to a specific date. since there is a manual intervention for the invoice to be sent, I was thinking to create a Custom Object that would track the invoices and the stages that they would be in. This would allow me to create the assocaition with the Production ticket. Is there anywau to see what the payment schedules are so i could create an object for each payment?