Can I update all my charges at once?

Yes. You can update multiple service charges on one screen if the charges are using the same Item code.

Go to the Demands listing screen and click Multi-update. This will bring up a separate screen on which you will need to select you relevant Landlord and Item. You can then select what it is you wish to update (e.g. Quantity or amount) and how you want to update these (e.g. increase by % or amount or update individually).