In order to add Attribute Set , You must have to define Custom fields/ Custom dropdowns beforehand.
How to add Custom fields/ Custom dropdowns:
Click on Products
Click on Custom fields/ Custom Dropdowns.
Note: you can delete any Custom fields/Custom Dropdowns by clicking on Delete
Click on Add New
Select whether you want to add an “Input field“ or a “Dropdown“
In input field you will have single value while in dropdown we have multiple values.
Steps for Editing a Custom fields/ Custom dropdowns:
Click on Custom fields/ Custom dropdowns from the sidebar.
Click on the Edit button for which you want to edit the Custom fields/ Custom dropdowns
Click on the save button to save the change.
How to add Attributes Set:
Once Custom fields/ dropdown is created , click on Attributes Set under Products
Click on Add New.
Enter a name for your attribute set
Select Attributes dropdowns and choose whether it is mandatory, primary or secondary
Click on Add
Your attribute set is created
Steps for Editing a Attributes Set:
Click on Attributes Set from the sidebar
Click on the Edit button for which you want to edit the Attributes Set.
Click on add button to Edit the attribute set .
Note: you can Delete any Attributes Set by clicking on Delete