An optional field, Display Name will be displayed as an alternative to the actual category name. Useful for when you have multiple categories with similar names, and only wish to display the common name.
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i.e.
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You have two categories, Bachmann HO and Bachmann N. They appear under HO Scale and N Scale respectively. If you don't enter a display name, the main menu would look like this:
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Main Menu<br>
     HO Scale<br>
          Bachmann HO<br>
     N Scale<br>
          Bachmann N
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If you use a display name, the main menu will now look like this:
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Main Menu<br>
     HO Scale<br>
          Bachmann<br>
     N Scale<br>
          Bachmann<br>
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If a display name is not specified, the Name field will be used in all menus.