When an Attribute Type is assigned to a Category, the Attribute will appear in the Attributes Panel. The Attributes Panel is part of the Item Entry screen, and appears after a Category is selected.
Attributes may be assigned at any Category Level - 1, 2, or 3. When an Attribute is assigned to a Level 1 Category, the Attribute Cascades to that Level 1 Categories’ Level 2 and Level 3 Categories. This means the Level 2 and 3 Categories Inherit Attributes from the Level 1 Category of which they are a sub-category.
When an Attribute is assigned to a Level 2 Category, that Attribute Cascades to its Level 3 (sub)Categories.
Note: It is only necessary to assign an Attribute Type to one Level in a particular Category. Do not assign an Attribute to more than one Category Level for a particular Category.
Example: Women's Apparel Sizes provides a good example of why one would choose to assign Attributes at a level other than Category Level 1. Dresses, Pants, and Tops may all use pretty much the same set of sizes, but shoe sizes are a different matter. Assigning the Attribute Women's Size to Dress, Pants and Tops at Level 2, and Women’s Shoe Size to Shoes at Level 2 lets you limit the number of Sizes appearing in each Size list when entering items. In other words, when entering Dresses, which have sizes like 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 etc. you’re not also looking at shoe sizes such as 4.5, 5, 5.5, 6, 6.5, 7, 7.5, etc. Definitions Of Attribute Fields & Buttons
Note: Default Values for attributes can be extremely useful for certain attributes (Condition, Gender, or website specific attributes), but shouldn't be used for highly variable attributes such as Brand, Size, or Color.
Delete Button : Select to remove the selected Attribute in the Attributes Panel for the selected Category. (Attributes cannot be deleted from a Category once they have been assigned and used. They can only be made Inactive.)

For information on adding your own, specific Attributes and Values, please see the sections entitled Add, Change, and Delete Attribute Types and Add, Edit, And Delete Attribute Values.
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Remove an Attribute from a Category
Assign Attributes Types to Categories Overview of Attributes Categories Overview Category Editor Make an Attribute Inactive Change Order of Attributes on Item Entry Screen Add, Change and Delete Attribute Types Add, Edit and Delete Attribute Values Printing the Size Attribute on Price tags Remove an Attribute from a Category Show Attributes in Item Titles