You must first create jobs in QuickBooks Desktop. Here’s how:
Once done, you can now enter timesheet for the employee, here’s an article how: https://community.intuit.com/articles/1771170-create-and-print-timesheets
You can also have the system enter the timesheet automatically on the employee’s paycheck. Here’s how:
I also have an article here about Jobs that might help you along the way: https://quickbooks.intuit.com/community/Help-Articles/Tracking-job-costs-in-QuickBooks-Desktop/m-p/2...
Let me know in the comments below if you need anything else.