Hey all, Is there a way to apply a discounts based on quantity sold for specific items to specific customers ? Same as Quantity Pricing schedule but for customer instead of suppliers

I think you can consider using SuitePromotions

If you are wanting to apply an actual discount line item, yes, SuitePromotions would work. If you're wanting to give discounted pricing based on quantities then I would look into using Quantity Pricing with Price Levels.