NEED TO FIX THE FOLLOWING:
PARTIAL PAYMENT
GROUP CUSTOMERS BY INVOICES, JUST LIKE REACHABLE (AUTOMATICALLY GROUP IF HAVE INVOICE)
PRINT ALL INVOICES
FROM POS, BE ABLE TO COMBINE NEW INVOICE WITH PREVIOUS INVOICES (MAYBE HAVE A FIELD THAT SAY COMBINE WITH INVOICE #)
THESE ARE MAJORE FIXES THAT WILL MAKE A HUGE DIFFERENCE!
