Auto-Create Line Items from Reference BP

Is it possible to auto-create line items from a reference BP?

For example, I have a Pre-Contract authorization process that requires line item details for payment milestones, their percentages and if POs have been issued, invoices sent or payment received. If we still haven't gotten a signed contract and the team is seeking authorization to continue beyond the approved funds/time previously granted a change request is necessary. So, a change request to the pre-contract authorization is created. But, the payment milestones should be the same between the original authorization and the change request. It's necessary to review these milestones every time to see if the status has changed in POs, invoices