https://www.fd4cast.co.uk/FD4Cast_Client_Task_Timesheets_Management_Tool.zip
Google Sheet with invoicing functionality link (Beta Version):
https://script.google.com/macros/s/AKfycbwL7qgq_8mhZZxN_Og0oMf4mNWbLE1oLJgm1AixwUDA8Td4uo0ocvZcQX7G6tV4C-0M/exec