Hi JasonP,
There’s no option to add additional expense types, however, everything you need should already be available.
If your client reimburses your expenses, you can mark this as rechargeable when logging the expense. In the Basics section, click on ‘Make this chargeable to a client’. You can then add this to your invoice to them. We’ve a guide on how to do this here.
Another option would be to set up a new supplier and call it something like ‘Expenses for X job’. Then, you can add all your expenses under that supplier and still specify what accounting category (accommodation, public transport, subsistance etc) they fall into.
Hope this helps.
Katie