How to set Template Conditions for a Category and all its Child categories?

How To
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1

How do I display a template on a category and all its Child categroies?
For example, display a template for a single post with all these: Articles → SEO, Business, Web.

Thanks in advance!

2

Are you asking about a template for categories or single posts?

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For Single Posts. So all Single Posts with Child categories of the same parent category share the same template.

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How do I apply this to child terms?

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