I appreciate the complete details that you gave regarding your price level concern, @Rashika.
At this time, there isn't a way to change the discount at every price level. The discount will be applied depending on the number of items that you've selected for the price rule.
If there are different prices of the item at each level, you'll need to manually enter the discount. You can also zero out the amount of the item upon creating the transaction and add a memo indicating why it has been zeroed out. Entering a 100% discount on the item will also remove its cost.
To give you more insights on how advanced pricing works in QuickBooks Desktop, please see this link: Use Advanced Pricing.
Know that our developers are always finding ways to cope with your business needs. I'd encourage you to visit our Firm of the Future site to be updated with our product road-maps.
Let me know if you have any other questions. I'll be right here to assist you further. Take care!