SharePoint columns help you group, categorize, and track information, such as the department name or project number. There are columns for a site, just like there are columns for lists and libraries. If you're no longer using a site column, you can delete it. (You can also delete a column in a SharePoint list or library.)
A site column is a shared column, and not created individually for each list.
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Select Settings, Site information, and then View all site settings.
(If you don't see Site information select Site contents, and then Site settings.)
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Under Web Designer Galleries, select Site columns.
(It's under Galleries in SharePoint 2010.) -
Scroll to the site column you want to delete and select the name.
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Select Delete.
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If you're sure you want to delete the site column permanently, select OK
Notes:
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To delete a site column, you must remove the column from any content types referencing it.
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Columns that can't be deleted can be hidden.