Use this guide to help you navigate some aspects of customizing the search in Orchard. Afterwards you will be able to index fields of a part in the example I will be using price and indexing a quick mock of products.
The key parts are:
The current navigation lacks the ability to hide individual menu items easily on the same menu group. A solution would be to create many menu sections and hide them on different menu widget layers. Instead, I have attempted to tackle this limitation by allowing each menu item to have its own rules keeping things down to the minimum amount of menus.
Aims: Create a selection filter for the slider projection. Lets say we only want 'feature' items appearing when we select them. We could go and fetch the ids and create a filter that way but having a check-box on the editor page for the content type is far more user friendly.