Dear Drisya,
1. Please can you tell me your attaching multiple invoice copies in a Invoice from VF01 and for 1 Invoice why you have to attach multiple copies. If you need to attach you have the attachment option in Invoices :
2. the Other option is you can send multiple attachment or smart forms as Mail once the Invoice is saved to the Mail id using output types .
Also do you have a SAP team to do the configurations.
Vino