Hi,
I was looking to do a site wide discount on all products. Can this be done and also show the discount on product/collection page like you would see when you do the price compair
you can use third-party app like All in one DIscount by cirkle Studio , recommend because of good reviews not paid , you can send email to their support chirag@cirklestudio.co he will assit you telll him manoj recommend you this app