If you don't work with an external accountant or accounting agency because you take your of your accounting yourself, this is called 'Interal accounting'. In that case, you can create your own Billit account for accountants and link it with your accounting software. You can find all options per accounting software on this page.
Please note: the BillSync installation is not free for internal accounting! Consult the table for all accounting software suites that require BillSync for installation. You can find more info here about installing BillSync for internal accounting.