We've added support for bulk editing unit prices. Now you can bulk edit this field with either an in-app edit or via spreadsheet. Unit pricing is a feature that currently only appears in European stores but it should be available to all stores this summer.
When editing unit prices with a spreadsheet you will need to include a JSON-formatted value that looks like this:
{"quantityUnit": "G", "quantityValue": 200.0, "referenceUnit": "KG", "referenceValue": 1}
