Hello,
Take our apologies for the delay in answering.
You can apply discount for products using the default WooCommerce option (WooCommerce > Coupons ) https://docs.woocommerce.com/document/coupon-management/?utm_source=blankslate&utm_medium=product&utm_content=couponsdoc&utm_campaign=woocommerceplugin
Or using WooCommerce Dynamic Pricing & Discounts plugin https://support.rightpress.net/hc/en-us/articles/201631796-Cart-Discounts
Regards