Split Invoice

Hi ,

there is a requirement that sales order with multiple item should have different invoice number and should generate at the same time for a order.

So I was thinking that in F4211 shipment number is if we do shipment confirmation different time so will that shipment number will be generated differently for all lines?

And then doing customization in Print invoice program instead of picking order number will pick shipment no and generate different invoice for all lines.

Is this possible or I want you to guide me how to fulfill this requirement?

Thanks in advance