You can add attributes after you have created a master product.
To add an attribute
1. On the Manage master products page, select a master product and page through to the attributes setup page (System Setup > Set up commerce web components > Manage master products).
2. Click Add Attribute.
The attribute drop-down is displayed.
3. Select a new attribute from the drop-down.
4. Click Add Attribute next to the drop-down.
The new attribute is displayed in the list.
