One invoice for many orders If necessary to issue one invoice for several Client orders, there are 2 approaches: One invoice for several selected orders Add each order one by one to the outgoing invoice 1. One invoice for several selected orders Open the Client order filter; Mark Outgoing invoice - Not issued; Selects the Client to whom invoices for orders must be issued; Confirm the filter. Press the Muti select button ; While holding the Ctrl key with the mouse, mark the orders for which an invoice must be created; Press the Functions button ; Chooses to create an outgoing invoice for marked orders; Selects New invoice, if a new invoice needs to be created, or selects an invoice already created for this client; Save - a prepared invoice will open.Read about further steps here . 2. Add each order one by one to the outgoing invoice Open the Client order , which will be added as the first in the combined invoice to the Client. Selects Create a new invoice and save. Open the next order of the same Customer , which must be added to the combined invoice, and select Add to invoice no. .... (this time the invoice previously created for the Customer will be visible here).