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Frequently we receive the question whether Magento attributes can not only be created in Excel or with cobby, but also deleted?
Here is the answer:
No - It is not possible to delete products or attribute options in Excel.
To delete attribute options you have to go to your Magento backend.
Path: Stores > Attributes > Options Stores > Attributes > Product >"Options".
Here you can delete the attribute options by clicking the button "Delete".
However, cobby is especially helpful when creating attribute options. How this works can be read here.