An automatically generated material or service item form includes the MaterialServiceType field. Its values Material and Service are stored in the MaterialServiceTypes enumeration. The default field view is a text box where values are selected from a drop-down list.
If the number of enumeration items is small (2-3 items), you can display the field as a switch. A switch can have one of the following types: a set of radio buttons or a tumbler. The second option better suits modern application interfaces.