This covers any orders you place where you are taking the items from the stock holding.
If you are delivering direct you should look at Back to Back orders and when you are ordering specifically to fulfil a requirement, such as EP orders or broking, then you should use the Advanced Orders functionality.
Some videos are below which should help you understand how to enter a new order onto the system
YouTube video showing the basics click on Standard Sales Orders - YouTube
YouTube video discussing the additional order options Order Options - YouTube
YouTube - sending underbond or duty free orders, watch this video for the additional entries needed for this type of order to a standard order Underbond Orders - YouTube