Hey All !! Please let me know if we can apply for promotions on PLP as well as PDP Actually, i want to show product discounts on PDP and PLP as well

Check

addPromotion

method under Cart component https://system.netsuite.com/help/helpcenter/en_US/APIs/SuiteCommerce/Extensibility/Frontend/Cart.html#addPromotion

@Mohammad Sharaf Ali i know we can add on cart !! actually I want this feature on PDP and PLP ! wanna show discounted prices of items on Product list and product detail pages

I guess you are looking for Strike-Through Pricing https://netsuite.custhelp.com/app/answers/detail/a_id/96470/