Invoices: Specify set number of lines on transaction that must be populated

As an ex Freshbooks user, I was able to specify the amount of product lines that an invoice was to contain. 

My company sells labour and issues invoices that list the staff that worked on a particular job. More often than not I need to add between 60-130 lines. 

It would be nice to be able to specify the number of lines that the invoice is to contain and which product code should be used. 
The reason isn't because I'm lazy. The reason for my request is that whilst it does make it easier it also serves as a way to double check to ensure that I have not missed anyone or any product that I had intended to be on the invoice. i.e If I have to invoice for 55 staff, I could specify 55 rows with product code ABC and then it's just a matter of filling in the details. Once at the end of the invoice there should not be any lines left over or I shouldn't have to create another one. 

Thanks

"Invoice line items"