How do I edit an existing sales order in POS365?
Update an existing sales order when items, order details, or payment information need to be changed.
Open the Order Manager and select the order you want to edit. From the order, you can add or remove items, update information such as shipping terms, payment terms, account, and location, or pay all or part of the order. Changes are saved when you close the order window.
Indepth guide link: "https://help.posone365.com/en/pos365/hc/en-dk/articles/19192181430044-how-to-edit-an-existing-order-in-the-order-manager"