Surcharge rate for extended care

Hi! I’m loving the app and would love to upgrade to the paid version; what’s currently holding me back is my inability of charging extended hours care for overnight booking (other than invoicing my clients but I’d like them to see exactly what they’ll be charged instead of having to explain to extra fee).

Example: Overnight boarding starts a 10AM on Sep. 13 and ends at 7PM on the 14th. I’d like to have an option to add 50% of my nightly rate when bookings exceed 24 hours.

Hope that makes sense.

Thanks!