Deleting Categories - Cannot delete a sub-category

Deleting Categories - Cannot delete a sub-category

I have manually deleted tickets relating to a particular sub-category, we have no problems in our database and only 4 changes, none of which use that sub-category.  Thsi sub-category has no items.  As far as I can tell Solutions use their own categorization hierarchy - am I missing some place categories are used?  Please provide a sample script for all the places needed to be unhitched before a category / subcategory or item is allowed to be fully deleted (not just greyed out for no further use).

/kdl

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