Rules to create multiple linked entities at once

Hi yall, here is my current structure:
Database Variant > each variant is linked to an other database Group of Variants
So a group of variants can have multiple variants, a variant can be linked to multiple groups
Example:
Group of variants: Size Range Women EU,
Variants in this group: 34, 36, 38, 40, 42,…

I can link a group of variants to an Article
When the user link the group to the article, I’d like to automatically link (actually create and link in a helper database “article x variant”) all the variants of this group to the current article.

In the rule menu I’m not sure where to tell it to generate the article in 34, 36, 38, 40 > may be a button seems easier but again I see only way to create them 1 by 1…

I have no clue how to script if it comes to that :frowning: it seems the script in this ticket might be related

Any insights?