Can we use one product for multiple display nodes in Commerce D8? I used to work with Drupal 7 Commerce and now I need help to work on D8 Commerce.

I have nodes on my D8 website and I need to sell them through Drupal Commerce.
Each node can be sold in the same conditioning with four variations, based on customer types.

I have created a store, a product variation type, an attribute, a product type and one product with four variations, considering that one product would be enough.

Each node needs to be available as an order item.
For that, I have added an entity reference field, linked to the product type.
I have thus filled the default value with the product created.

Now on each node page, I have my add to cart button (through Commerce block or custom Views block, it works).

My problem :

Viewing the node A, I choose the variation and add the product in the cart and everything is fine.

Viewing the node B, I choose the exact same variation and add the product and there I need a second order item line with the node title (added through Views with relation to the entity reference field, not the issue here).

Unfortunately I get one order line item with quantity 2 (if I add the node title, I get two order line items with quantity 2 for each).

It may look obvious but I need to know if I really have to create one product with four variations for each node (2000+)?

Or is there a way to achieve this with D8 Commerce with only one product?

My concern here is to use properly Drupal Commerce and of course avoid the long multiple creation of products, especially in the future for my end user.

Related threads:

Automatically generate product variations
Drupal 8 Commerce does not need product display nodes anymore. When we create a product, we get a page automatically for this product.

But if you need, like me, to keep a "node environment"  on your website then you will have to create as much products as nodes and link them through an entity reference field (Type : Reference > Other...)

To create products, variations and links between nodes and products, I use Feeds, Commerce Feeds and Feeds Tamper. In my case, each feed type is based on upload file technique with CSV file created from Excel.

First, you build a Variations Feed type to create product variations with simple data (sku (unique), price, your_attribute). In my case, customer type was the attribute.

Second, you build a Products Feed type to create products using variations imported before (title (unique), variations (skus), store (required, ID=1 if you have only one). Here goes Feeds Tamper with List explode to get multiple variations for one product.

Third, you build a Nodes feed type to link nodes and products with two data (node title (unique), product title (in entity reference field)).

Finally, you get display nodes with specific products and variations and when you add to cart, products are well separated.

Hope this helps.