In Step 7, the macro should be attached to the FIRST combo box. Read the instruction "double-click the embedded control and enter the following procedure:" as "click on the FIRST box you created and then click on the View Code button on the Developer ribbon (Excel 2007). The first and last lines of the macro will be filled in for you. Copy and paste the other lines of the code, except the first and last. You might also need break the lines with a stroke of the Enter key as needed."