Processing orders in Magento
Magento Orders – with Magento orders your customers are able to make online orders via the webshop or to create orders into admin control panel.
Once a customer make an order, an e-mail will be sent to the customer with the sales order made at your store.
You can review the Orders from you store in the admin control panel
Sales > Orders
At this stage the order is just a temporary record, once created you are available to Cancel, Hold, Unhold and Print Invoices etc.
Sales => Orders => Select an order => Action => Submit

- Cancel – This option will cancel the selected Orders when you press Submit.
- Hold – This option will set the Order status of all selected Orders to On Hold.
- Unhold – This option will set the Order status of all selected Orders back to the status they held prior to being put On Hold.
- Print Invoices – This option will open a .pdf file containing all the Invoice information for all Invoices associated to all selected Orders.
- Print Packing Slips – This option will open a .pdf file containing all the Shipment information for all Shipments associated to all selected Orders.
- Print Credit Memos – This option will open a .pdf file containing all the Credit Memo information for all Credit Memos associated to all selected Orders.
- Print All – This option will open a .pdf file containing all the Invoice, Shipment, and Credit Memo information for all Invoices, Shipments, and Credit Memos associated to all selected Orders.
You can edit if any orders that is not correct, just click Sales => Orders => Select the order you want to edit

Magento Invoices – An invoice is a record of itemized statement of money owed for goods shipped or services rendered within your store functionality, if you accept any online payment such as (Paypal, Wire transfer etc) the invoice will be created concurrently and there is no need for any confirmation from your side.
Sales => Invoices
You are able to save the invoices as pdf file in your computer.
Sales => Invoices => Select an invoice => Action => Submit

Magento Shipment/ Deliveries - You are able to create a shipment once an order has been made and paid. The shipment record represent the order has been shipped to customer.
Sales => Shipment/ Deliveries

Credit Memo – You are able to create a credit memo, in the case of any refunds to customers. You can refund to any customer who had successfully ordered and was invoiced.
Sales => Credit Memos

All records such as Orders, Invoices, Shipments and Credit Memos have an e-mail template which will be sent to customers as notices.
You can edit this template or custom with your own design theme.
To make any editing to this e-mail template, sign in to admin control panel.
System => Transactional E-mails
If you have any trouble with the Transactional e-mails please review our article regarding How to create and edit transactional e-mails in Magento Commerce.
Good luck! Source
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