How to change attribute set in Magento?
To change the product attribute set in Magento, log in to the admin panel and go to Catalog > Manage Products. Select the needed Magento products and choose Change Attribute Set from the Action dropdown right on the grid.
Please note that the editing of the attribute set can not change the type of Magento product and convert simple products to configurable ones and vice versa.
→ Looking for Magento 2 guide about attribute sets? Check out the official documentation to learn everyihtning about Magento 2 attribute types and how to change them.