For example I have one product with several atrributes(T-shirt with various colors and sizes). Can I assign one SKU for all colors? I have asked this question on official forum - but no luck, no answer. I have posted ticket at Commerce support - they told me to use the Commerce Customizable Products - I don't no how to use this module. Maybe somebody have solution? I will be grateful for any help.
3 Answers
The SKUs can never be the same for two products. They should stay unique.
The details can be found on https://drupal.stackexchange.com/a/54047/10021
P.S. Drupal related questions should go to https://drupal.stackexchange.com/
I believe u have only one product called T-Shirt but different product attributes. so only one sku is allowed for one product u cannot have one 2 sku for same product. if u want different sku create it as two separate products.

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One thing you can do is to create an Option set. So you create one product "T-SHIRT" and you have a field option set that allows you to pick the colour of the shirt and another for the size.
https://www.drupal.org/project/commerce_option
If you need these different options to be different prices, you can also use the pricing attribtues module.

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