How to make an offer to buy an additional item in the cart, with a discount (WooCommerce)?

Question

WordPress

Hello!
Question number 1. The essence of the question is that when there is a product from certain categories in the basket, it is necessary to offer the purchase of another product at a discount , which in turn is also sold but without a discount. How to offer a product is understandable. But how do you discount it? What is now is shown in the screenshot.
Also, there is the following question, but not on the topic. I would be very grateful to receive an answer to it.
Question number 2. How to display a certain number of product columns somewhere, based on the number of products? For an example, again, please look at the screenshot. It shows that 1 product is displayed, but places are provided for 2. How to make that, based on the quantity of goods, as many columns of goods as needed are displayed?