Hello Jamie.

Thank you for reaching out to us.

Something like this can't be done with the plugin's built-in features, but there's a way to apply custom text to the "Total Amount" or "Subtotal" in Amelia's Booking Form on the "Payments" summary so that customers are aware that the price is per hour. 

I recommend using the Loco Translate plugin, it is the easiest for this :

If I open Loco Translate and choose English US because my site is in that language ( you will use your site language, of course), 

 I search for the string  " Total Amount", and simply "translate" / change it to anything I need and hit "save" : 

You can find these Strings "Subtotal", and "Total amount":

In our example, we add "short text" like Total Amount ( inc. GST) :

That was just an example - you can write any text you need there. (The same principle goes if you need to translate/change any other strings in Amelia)

Let me know if that works for you.