Interconnecting products in the store

I have two product groups in my store.
Main products and complementary products (accessories).
How do I set up specific accessories to be displayed next to the main product, e.g. using the post link field - hashtags criterion?
I have set up main products and entered hashtags in this accessory product, but main products (others that have the same related accessories) are also displayed. Shouldn't only accessories be displayed by hashtags?
For example: https://www.sauermann.com.pl/pompki-skroplin/pompka-skroplin-si-27-kondensatu -
In this case, the si30 condenser pump should not be displayed in the "zalecane akcesoria"

Tom

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