Product page, grid with created articles, no variant

[diltech]

Hello,

I'm looking for a module where I can list the variants of 1 article without using attributes, the list has to take it from existing articles. I have a management system where exporting to Prestashop does not create variants but articles, eg:
art. 1000 - parent item (not salable but with price)
art. 1000.1 child article color blue (invisible on the product list)
art. 1000.2 child article red color (invisible on the product list)
etc ...

If I use the attributes, the management software cannot manage quantities and orders because the variants are created and they are not virtual.
Does such a form exist?
Thank you