there is a "import from Ei" in EA on the list on the left...but beware it wiped my whole EA system out. I am not happy at all with this system. it cleared all payments, invoices and even wiped my journal without even a warning. I have been so pissed I have not even tried to redo anything. the only software that links together is inventoria stock levels and respective individual software. so to be clear invoices/sales created in Ei, Copper POS, will not "Auto" post into EA. except what is mentioned above upon payment.
It would be my suggestion to allow restricted web access to EA (invoicing only) to create quotes/invoices
Good luck