You can delete custom lookup tables that are no longer necessary for custom fields. However, you will not be able to delete a custom lookup table if it is used by a custom field or if any of its items is used in a project auto naming pattern in custom object definitions.
1.On the Custom Lookup Tables screen, select the custom lookup table you would like to delete in the Show items belonging to drop-down list. 2.Click Delete Table. 3.When asked to confirm your action, click OK. If the table is already being used in records, you will receive the appropriate message, otherwise the table with all of its items is deleted from the database.
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