I would like a feature that would allow you to tie an Expense to an existing Invoice. For Example, in my business I sell items that I may not have in my personal stock, but my vendor will ship directly to my customer. I will invoice my customer and collect payment, then I will contact the vendor to ship the item. I pay the vendor directly. So technically the expense is billed and covered by the customer, however at the time of the sale the billable expense amount is not known to me until after the customer invoice has already been closed. In theory if there was a way for the billable total to be deducted on the expense reporting side based on the gross total from the paid invoice then you would see the circle completed and would not have a bunch of unbillable expenses that were actually covered expenses.