Remove Catalog Items and Types that are not required ABD v8i

I have copied the Dataset to our network and want to remove all of the unnecessary files that get loaded up by AECOsim.In the Catalog editor is it possible to remove the Disciplines that are not required? For example, can I remove Plumbing, Fire Protection and LPG from the list? 

If we can't remove the discipline how can I delete the Items? when I right-click on an Item the Delete option is greyed out.

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