How to show only Discounted or featured product?

You need to created an unpublished category and add that category to your discounted/featured products. Then, in a products listing module's associated category option, select that category and it will display a listing of the products of that category.

Here is a step by step to create a products listing module:
www.hikashop.com/en/support/documentatio...html#products_module

Just set the associated category to the unpbulished category as I explained in my previous post after setting up the module and that will work.