The Related Products module for Dolibarr is now available for versions 3.5 to 4.x.
It now allows copying related products to another product and also when cloning a product.
You can found more information about this module here: https://www.altairis.fr/produits-associes-pour-dolibarr/).
The Related Products module is available on Dolistore at: https://www.dolistore.com/en/modules/614-Produits-associ–s.html
(20% of the sales amount goes directly to the association Dolibarr)