When a sales order is completed, an invoice is not automatically generated. 

I can bulk create invoice in Sales Order via Actions > Create Invoice but this combines orders with the same customer to be in a single invoice. This is not preferred since it makes reconciliation of payments harder. 

Appreciate if anyone can enlighten me on either:

1) Automating invoice creation on shipment completion or

2) Using the bulk invoice create button but somehow change settings somewhere so that invoices are not consolidated.

Thank you