Check out these Steps in Magento's Admin Panel
1) Go to Promotions -> Catalog Price Rules -> Add New Rule
Product Discount 20% Active Main Website Notlogged in, General, Employees From & To Date
Conditions Brand is Kia
Actions By Percentage of the original price 20 No Yes
2) Adding Disruptors on the Product
Setting up the Configurable Product
Catalog -> Manage Products Select SKU (Configurable(Type)) Select All (Selection of one by one is prefer) Actions -> Update Attribute Attributes -> Higlight Percentage 20%