How can I create a new case in switch statement that depends on the previous case

Working fiddle of the what I am trying to do : http://ift.tt/1JreGgJ

The category and products drop down are working using a switch statement.

What I want to do is :

Add a new case called Wattage. The user selects a product and a respective wattage for that product is displayed everytime.

below is my attempt at pseudo code

// define wattage array
function configureDropDownLists(category, products) {

    var refrigerators = new Array('Artic King AEB', 'Artic King ATMA', 'Avanti Compact', 'Bosch SS');
    var dishWasher = new Array('Bosch - SHXUC', 'Asko DS', 'Blomberg', 'Amana');

    var wattage = newArray {
        Artic King AEB: 270,
        Artic King ATMA: 311,
        Avanti Compact: 340,
        Bosch SS: 214,
        Bosch - SHXUC: 200,
        Asko DS: 187,
        Blomberg: 236,
        Amana: 150
    };

    );

switch (category.value) {
    case 'refrigerators':
        products.options.length = 0;
        for (i = 0; i < refrigerators.length; i++) {
            createOption(products, refrigerators[i], refrigerators[i]);
        }
        break;
    case 'dishWasher':
        products.options.length = 0;
        for (i = 0; i < dishWasher.length; i++) {
            createOption(products, dishWasher[i], dishWasher[i]);
        }
        break;

    case 'wattage':
        // on change run through the dishWasher array to match wattage
        // products names matches then display the wattage

        // or

        // if(products.options == wattage.options)
        // display wattage
}
break;

default: products.options.length = 0;
break;
}
}

Also how do I keep my drop downs selected (once the user has completed selection of the product.)

Thanks