All my product cost the same. So I would like to have my product price as normal up to 6 items selected. From 7 to 9 items selected I want a new price and from 12 items an onward another price. Can this be done by using liquid and math filter?
I need the price changing in the cart...
Shopify will not support price changes for this. You can only do it with app, liquid can't solve it.
With liquid you can only change display, but when customer add to cart or go to checkout page, it will show the same price as original setup.
Hope it clear to you.