Hi,
I have completely understood your requirements. The application developed will be web based, which means, the users can login from their browsers, and review, update and monitor the information as it changes. The application will allow you to print the receipt at check out, calculate all necessary costs, hours. Any additional feature, function can be added effortlessly!
Please drop me a message so we can work to make this application a reality! I look forward to delivering really good results! Thanks.