Store owners are able to determine the size of discount by default.

If you own the full suite, you will also be able to change the number of pieces to be sold. This allows you to protect inventory and margins. 

Click the settings button next to the Merchandising Queue.

A pop up opens. Use the sliders to determine your default % of price and default % of sale quantity you wish to set. 

For example, if you wish to always sell your products for 33% off and you only wish to sell 50% of your products, your sliders would look like this:

Click Update Shop

Your defaults are now set. Defaults are only applied the first time a product is added to the Merchandising Queue. After it has been added, users will need to update the sale price and sale quantities.