monthly statements

We're having some trouble with our monthly statements. Because many of our customers have multiple billing addresses, generating statements in NetSuite doesn't work because the statements appear to be generated per Customer per default billing address (An example is a client purchases a course and the billing goes to their company and then the client also buys a book where the billing goes to a different billing address --> we need 2 individual billing statements)

I have a query that lists Invoices open > 30 days where you can print/email the invoices. This is fine except some clients may have multiple invoices open to bill to the same address. Is there any way to combine those individual invoices into one statement? Or is there a better way to bill monthly?