Hi Sri
Why do you need to print vendor invoices? It does not make sense, since you will be getting the same in hard copy or digitized form from your vendors already. You just need to capture them in SAP to book the liability and pay as & when invoices are due. If still you need to print the output after capturing the invoices, you can look at the below link.
Correspondence configuration | SCN
Regards
Sanil Bhandari