Sub Specialty Contractor

Good Morning 

We have approximately 150 employees and have both a service and construction department.  Can anyone share with me how you process service invoicing?  We receive between 100 & 200 vendor invoices a day that attach from a PO to a work order for billing purposes.  We use SFO (Operix) for service invoices and PO processing and Intacct for accounting purposes. 

Does anyone have a third party vendor that manages the import of invoices into the SFO PO and to Intacct?

Se