You can create links to filter New, Featured and On Sale items. Replace [storeid] with your store/client id. You can find this ID in other URLs within your store.

View All Products On Sale
/default.asp?clientid=[storeid]&f=products_view&d=estore&onsale=1

View All Featured Products
​ /default.asp?clientid=[storeid]&f=products_view&d=estore&featured=1

View All New Items
/default.asp?clientid=[storeid]&f=products_view&d=estore&newitem=1

This link will show all products with the specified filter. If you want to narrow by filter within a category, you must specify the category ID in the URL as well.

The best way to create URLs, would be to browse your website, then navigate to the correct category where the products are displayed on your site. Grab the URL from the browser, then add the variable, for example new items, "&newitem=1" to the URL.