@zaocare Hi
avoid acronyms without at least once specifying explicitly what you mean: MRP is material resource planning for manufacturing not for merchandising displays.
To so an MRP MSRP, manufacturer suggest retail price, use line-item properties to get some sort of messaging in the checkout step per line item.
https://community.shopify.com/topic/616503
Otherwise duplicate products for specific customers to have it in the product/variant title.
There’s also baking the text into the product/variants images themselves as that will carry through pretty much everywhere multi-channel, checkout and notifications, marketplaces, etc.
Or if discount titles/campaign names show in checkout just bake static messaging into the discounts or discount-code itselff but that will not adapt per line-item
On shopifyPlus maybe possible with checkout extensions for discount behaviors or cart transformations?
If you need theme customizations to show line-item-properties etc then contact me by my email for services.
Contact info in forum signature.
ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail in ALL correspondence.