Gives admin the ability to specify up to 4 (extra) different prices for each item in the catalogue. These prices are automatically associated with 4 specially named customer groups - customers belonging to a certain group, will see the price for that group.
You can specify 4 groups named "Group A", "Group B", "Group C" and "Group D". These groups, once added in Customers>Group Pricing, will add additional price entries in the item modification page. Instead of just seeing Price, you will see Price and Group A Price so that you can specify different prices per item for each group.
These prices will be shown when customers put in that group navigate through the product info. Any other group name will apply the standard discount at checkout but still, as normal, show the original price during the shopping process.