With the new Sales price experience, to be enabled in Feature management, you have the possibility to create new Purchase Price Lists for vendors. To create a new Price List you can make a filter on your items and set an adjustment factor to be applied to calculate the new price.
The problem is that you can only filter the items on fields on the item card, but not on a global dimension value that is related to the items. Many customers use a global dimension to create product groups and organize their items in that way. It should be possible to filter on that group, the global dimension, to make item selections.

So, it would be a good idea to add the global dimension fields related to items as possible filters, in the way you can do in the Sales Price Worksheet