Thanks for the instructions, @DaveW - very easy to follow.
I've imported all the supercharger geofences, but do you know if there's a way of going back through historical charges and adding how much it cost? I don't have many so it shouldn't be too laborious to add the data manually with reference to my tesla account. Just would be nice to be able to have the cost data available to analyse. Cheers.
Glad it helped
Go to the charges dashboard, find any you want to change and click in Cost, you can then manually type in the price