Number: automatically generated. You can override, but you can also customize the numbering scheme (see Configuring Number Schemes).
Copy To: to change from a quote to an order or contract, you can copy the order.
Buyer / Address / Contact: the buyer of the product, their address, and contact information.
Seller / Address / Contact: the seller of the product, their address, and contact information.
Ship To / Address / Contact: the recipient of the product, their address, and contact information.
Reference 1: for customer/seller references that help them correlate. For example, a purchase or sales number from them.
Reference 2: same as above, but a separate field if needed.
Parent / Contract: if this is an order, then it can be used to fulfill a contract, listed here.
Memo: a general memo which may appear on bookings, shipment advice, and other reports.
Payment Terms
Commercial Terms / Basis
Currency
Source: web? sales person? referral? you can use this however you want -- it's not currently shown on any reports
Line Items (see Sales Contract Items)
Shipments: associated with this order
Applies To: other contracts or orders associated with this one, if any
Dates
Additional Terms: standard terms associated with the order. You can also add more terms (see Template Terms)
Notes: log for internal use
Attachments: attach any kind of document and store it alongside this orderÂ
Queues: (see Queues (Workflow))
Invoices & Bills: associated with this order