To define a Text Popup attribute:
On the Category page, click Text: Popup in the Add Attribute drop-down list.
On the Add Attribute To page, type a name for the attribute in the Name field.
In the Rows section, do the following:
Click the name of the attribute after which you want the new attribute to appear on the Category page in the After drop-down list. Click <None> to set the attribute to appear first.
Select or clear the following check boxes:
To set each value that appears in the attribute's popup list, type text on each line in the Valid Value field, pressing ENTER after you type each line. The maximum number of characters allowed for each value is 254.
On the Category page, type any default values for the attribute.