You can set your own defaults setting, for speed of entering a new Customer.
Default Settings
Sales Order Processing
Sales orders processing, takes an order straight through to an invoice, after a delivery note has been processed. You can also, only take part of an order through, with the rest to follow.
Sales Invoice Entry
You can raise a Sales Invoice, and post without using the Sales order Processing.
Sales Ledger Credit Note
Sales ledger Credit Notes can be a raised from a copy of the Sales Invoice held in the System. This helps to speed up credit notes.