Product Group Price
For Bundle products, the group price is specified as a discount percentage. If bundle items have their own group prices set for the same customer group, then the discount specified for the entire Bundle applies to the group prices.
For Grouped products, the Group Price is not applied, even if the product type is selected in the Apply To field of the group_price attribute. In this case, the Group Price field does not appear in the Prices section of Product Information.