Out of the box Dynamics 365 PSA only allows for when submitting expenses, to add the Net Amount and the Sales Tax Amount. This is unintuitive, and requires additional calculations from the person entering the expense.

It would be much more user friendly and intuitive to have the option to add the Gross Amount (ie. the total expense value), and the Sales Tax Amount seperately. There is no functionality to do this at the moment without the use of some complex third party plugins.