Any way to customize Field Service Invoicing details?

Hi All,

Is there any way to customize the Field Service invoicing process?  I'm talking about the actual process creating the invoices.  I have a requirement to populate more fields of the invoice, for example: set an invoice date, set custom due date and set a specific status.  I know I can achieve this with a workflow, however was just wondering if this could be achieved within the process itself.

Thanks!