Hello there, @info225,
Currently, there isn't a way to create a new expense detail type in the program.
As an alternative, you can choose the detail type that is the nearest match. You can see the screenshot below for your reference.
For more information, here's a great article you can refer to: View or Change Account Detail Types.
This will get the information you need for today, @info225.
Please know I'm always here to help if you need anything else. Have a good one.