To bulk update Vendor, Item Cost, Unit/Case etc.. use the following steps:
Manually update purchase information in bulk:
Login into your CStore Essentials Account
Go to Price Book > Bulk Update
On the top-right click on
Purchase Packs
Search the items using the search criteria identified
Enter the purchase information and click on the down arrow next to new purchase blue to apply changes to all the items.
Click on Save Changes button to save the changes