Please share your site URL,
So I will check and provide a solution here.
https://lovedeedstore.com/ this is my store. I have a few items on sale original price $79.99 but are 50% off so when they check out it only says $39.99. I would like it to include the total savings from the current 50% off promotion and if they order any other products.
It can be done by doing some code customization. please send me a personal message and we can discuss what you'd like