Single-Select attribute types
If the list of options is relatively short, and does not change often, you can use the Single-Select attribute type. It can appear on a form as either a drop-down list or a radio button group.
The choices are supplied from a list of pre-defined options that you specify when you create the attribute. The user can select only one choice from the list.
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When you create the attribute, you use the Field Type field to specify its appearance:
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When you create a Single-Select attribute, you must specify the list of items the user can choose from. The following table describes the fields you use.
A text box you use to enter a new value. After you enter a value, click Add to add the value to the list of allowed values.
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Remove: click to remove the selected value.
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Up: click to move the selected value up in the list
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Down: click to move the selected value down in the list.