When I add new attribute to attibute set (like 'second color') I see it when i add new product with that set of attributes, but in old products I don't see it in "Associated Products" -> "Quick simple product creation".
How I can solve that problem?
We use Magento 1.9.3.
"Quick simple product creation" displays the super attributes used when you created the configurable product. You can't change the super attributes once the configurable product is created.
A customer requested me the same feature. He wants to add a configurable attribute to an existing configurable product. If you're interested, I can add the feature in my software