To be used in conjunction with {{Non-diffusing subcategory}}

{{Non-diffusing parent category|subcategory|subcategory2|subcategory3|subcategory4}}

subcategory – the subcategory (without the prefix "Category:") that has a non-diffusing relationship with the category that this template is placed on.
subcategory2/3/4 – Further subcategories (up to four) can be listed in the template to document parents that have multiple non-diffusive subcategories.
Single

{{Non-diffusing parent category|Best Actor Academy Award winners}}

produces:

Multiple

{{Non-diffusing parent category|Scottish long-distance runners|English long-distance runners}}

produces:

Other category header templates

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