Help With BuyX

I am trying to setup a simple buy 1 bag of an item and get 50% of the 1 bag. Would like to do foe multiple bags. Buy 10 get 50% off 5. Is this possible? I thought I might have it with below? Thank you

Secret Key xxxxxx

Published

Function TypeBuyX GetY

Number of Uses Unlimited

Percent or Amount Percent

Discount Type Only GetY

Value 50.00000

Process Type First found match

Display Text Buy 1 Get 50% Off Another

BuyX 1 

GetY 1

Don't Mix Products No

Automatically add to cart 'Get Y' product Yes

Automatically delete from cart 'Get Y' product No

Start Date 2021-02-08 05:00:00 

Expiration 2021-02-21 04:59:59 

Exclude Specials, Discounted