If-Condition for category and related subcategories in product.tpl, PS 1.6.1.24, how?

[Rayna Butler]

I like to show content on product pages only when the product is in a dedicated category and their subcategories.

I do this in product.tpl like this at the moment.

{if $category->id == 614 
OR $category->id == 532
OR $category->id == 657
OR $category->id == 658
} 

...

{/if}

I am pretty sure there is a better way like "if $category->id == 614 and all subcategories"

How can I achieve that in Prestashop 1.6.1.24

Thanks,

Dirk