Wordpress Product Selection Tool

Our current site is based on the WordPress and we need to add a product selection tool to the site. The tool is based on the drop-down menu which will list the product options selected by customers. The product options are based on the features and specs for each product. The tool needs to narrow down the product selection based on the step-by-step product elimination based on user selected options. So the database knowledge is the key. Attached document contains more details about the project. Please complete price with no hidden costs! Payment is due upon completion, that is, if the site is online and working.