• Log into Web TimeSheet with administrative rights.
  • Select the Administration icon from the top menu.
  • On the side menu, click on System Preferences under System, and check Timesheet Screen section, Specify location for client column on timesheet. Set this option to Right of Project/Task and click on Save.
  • Click on the Timesheet icon, to load the timesheet page.
  • Select the appropriate Projects/Tasks in the timesheet. Once done, the Client column should auto-populate.

Note:
Enabling any option under System Preferences will affect all users as it's a global setting.