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 whole bundle product applies to the group prices.
For the Grouped and Gift Card product types, the Group Price is not applied, even if these product types are selected in the Apply To field of the group_price attribute. In this case, for Grouped products, the Group Price field does not appear on the Prices page in Product Information. For Gift Card products, the Group Price field appears, but is not used.