When entering items into Liberty the Categories you wish to use must be Active. To Activate Categories, use the Category Editor. (It is also possible to activate categories in the Set Up Wizard when Liberty is first installed.)
You also have the ability to determine which Active Categories are visible or invisible in the Select Category dialog in the Item Entry window. The default is for all Categories to be Visible.
Why make a Category Active but Invisible? Doing so reduces the number of Categories shown in the Select Category dialog, without removing the ability to use that particular Category. This is ideal for Categories that are rarely used.

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Add, Change and Delete Categories