On the Terms / Pricing tab of a Customer account are a number of additional slider options, these turn blue when activated.

Require an order number on quotes and invoices:  If selected, to post an invoice will require an order number to be supplied by the Customer.

International customer (GST Exempt): Accounts activated for this will have no GST calculated on Invoices and Quotes created for them.

Send Statements:  Deselecting this option excludes the Customer from statement runs.

Accepts backorders: Enables the backorder option on Customer Invoices.

Allow discount matrix pricing: This option allows discount matrix pricing to be activated / deactivated at the Customer level.

Include pricing on packing slips: If the standard packing slip option is selected, this will Include the pricing on the packing slip for this customer.