General tab - Text Content Locator Properties window
The Define Subfields table is where you to add, remove, rename, and reorder the subfields that are used for this locator.
In addition to the common Project Builder buttons, the following buttons are provided:
Adds a subfield to the Define Subfields list. The subfield name is editable when it is first added or you can double-click the subfield to edit its name at a later time.
Removes the selected subfield from the list.This does not delete the associated field if one is mapped to the deleted subfield.
Definitions for the buttons at the bottom of this window can be found in Common Project Builder Buttons.