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[Ayla]

I have a custom navigation where clicking subcategories will link to the search results page and show subcategories. I can get it to search for 1 subcategory using this URL:

/search.php?mode=search&substring=%25&categoryid=13 0&search_in_subcategories=on

I tried to change include/search.php, but that file is too interconnected to augment.

What I am looking for is a query string by which I can simply search for multiple subcategories. Something like this:

/search.php?categoryids=130,140,150

or by name if that's easier:

/search.php?categorynames=cat_one,cat_two,cat_three

Thanks in advance for any help provided!