Change price and discount% for products


I have set up a new store and adding products.

I have set up pricing formula rules. However, I want to know how to change old price and discount% for products with variations.

If a product is priced at $5 at aliexpress, I set up rule as 2x. The selling price in my site is $10. But the discount % is showing very low, like 2% etc, coz its taking discount shown in aliexpress.
I am able to change this if prices of all variants are same. How to change when each variant is priced different?

Can I give old and new price manually and show difference as discount for each product?

Thanks in advance.
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