You can apply an updated exchange rate to multiple raw materials / variants in the list view.
Important: Additional Currencies are an optional add-on in Zedonk. If you are interested in adding these to your account please reach out and say HELLO ZEDONK
From the Raw Materials dropdown select [Exchange Rate]
Select a currency from dropdown to filter the Raw Materials purchased in that specific currency
Tip: Your base currency will be in Italics as this rate cannot be amended