Product TAG in articles

-- url of the page with the problem -- : ccpharmacy.com.au/
-- HikaShop version -- : 3.2.0
-- Joomla version -- : 3.8.1
-- PHP version -- : 55.6.31
-- Browser(s) name and version -- : Opera 48

Hi,
I was following the tutorial here;

www.hikashop.com/support/documentation/1...-product-insert.html

and we can only seem to select articles manually. Is there a way to select categories or groups of products based on other parameters (e.g. keyword tags). We have over 4000 products, so it's not an easy process to go through the full list.

Thanks,
Ian and Stu