Users can invite subcontractors to bill inside Procore and collaboratively review the scope of work breakdown or invoicing. Owner invoices can be prefilled with approved subcontractor invoices and custom bill groups can be created to tailor invoices. Procore says the system offers more efficient and trackable processes with  leverage integrations to create lien documents inside the system and attach them to invoices.Documents such as contracts, subcontractor invoices, owner invoices, and lien waivers can be signed via the Procore + DocuSign integration.