Intergrated Purchase orders?

Intergrated Purchase orders?

is there any way you can create and track purchase orders from within Zoho Projects?? i need to create PO's for subcontractors throughout a constructon project - i realise that CRM has this - would i have to make every subcontractor a vendor and create the PO in CRM? 
is there any way you could keep a running total of PO's for cost control purposes?