I would like to 'hide' a category from visitors rather than 'disable' it in admin - the items in the category are linked to other categories but I would like them to be active in the store and visible to visitors only in the 'linked' category and for the 'main' category to not visible to visitors - so the items only appear once in the store.

If this is possible, can anyone advise me how to do it??

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Background Reason.
I have a number of items which are too heavy to ship and require collection only, but each item is from a different 'category' - eg exercise equipment or tooling.

I have seen a mod by AJEH which will allow me to only have 'store pickup' as an option for a specific category (using a hard code of the category ID).
However this requires all 'collection only' items to be in the same category (eg 'Store Pickup') rather than in their 'real' categories.

My thought was to add all collection only items to the same category ('Store Pickup') then to 'link' them to their correct categories for viewing - BUT to hide the 'Store Pickup' category so they don't appear twice in the store.