If you use the User Defined Fields optional add-on module, this allows you to add any number of extra fields to a sales order that pertain to your sales orders for your business.
User Defined fields allows you to add any number of extra fields to a sales order that pertain to your sales orders for your business. To be able to edit the design of the UDF (User Defined Fields) the user needs to have the correct security access. Read the User Defined Fields manual topic for more information.