post https://api-us.bluestonepim.com/pim/products//connections/products/
This operation allows you to create new relations between a
product and multiple other products for a specified relation definition. Note: If any of the specified other
products already are related to the product using the specified relation definition, a HTTP 400 will be returned
and no new relations will be created. For more details on working with products and relations, refer to the Add
product relations.