I use the function Group Price to set a special price to a wholesaler group, but since prices are changed from time to time, and I have hundreds of products, price updates are very time consuming.
However, the wholesaler group prices are calculated as the manufacturer's prices (my price) plus a percent value (X). In short: [My Price] + X% = Wholesale price.
I just want to add the manufacturer's price once, and then be able to update all wholesale prices by changing the percent value (X). Is this possible in Magento?