Bulk Price Editor
Adding a new Bulk Price Group
admin > promotion > Bulk Prices
add new
fill in the boxes as you do with the discount codes
eg select a brand and add 40 in the box next to the brand selector for 40% off all products in that brand [who arent already part of another bulk price group]
click 'set prices'
NOTE: products can only be part of one group at a time, but they arent excluded from the dropdown selectors
if the product is already part of a bulk group (either as an individual product selection, or as part of a brand selection)
then its prices wont be changed (there is no notification for this)
Reverting a Bulk Price Group
admin > promotion > Bulk Prices
click the group you want to revert prices
click the revert prices button
This will set all products in that group back to their original prices
NOTE: deleting the group does not revert its prices.