SUMMARY:
In Web TimeSheet a timeoff can either be added or booked. Booked timeoff's go through the timeoff approval path. However timeoff's added on the timesheet follows the timesheet approval path.
 
There could be situations where users may not be able to book a time off and they may have to add the same, when they are back to work.  An ideal example would be Sick leave.  Users can simply add a timeoff against the sick time-off type, in the timesheet once they return to work. This timeoff goes to the timesheet approver and follows the timesheet approval path.

To enable a timeoff type to be added and not booked follow the steps:
Log into Web TimeSheet as an Administrator.
Click on the Administration tab in the top menu.
Click on Timeoff types under the Time Off Setup section in the side menu.
Click on the edit button beside the specific timeoff type.
Make sure the check box beside Booking Required is unchecked.
Save the settings, by clicking the Save button.
 

For a user to Add a timeoff on the timesheet he should have the option enabled in a permission enabled for him.
 

To enable Add TimeOff button on the time-sheet:
Log into Web TimeSheet as an Administrator.
Click on the Administration tab in the top menu.
Click on Permissions under the Users/Departments section in the side menu.
Click on the edit button beside the permission you want to edit.
Expand Timesheet section of the permission by clicking on the '+' icon beside it.
Under the Use Timesheet sub-section, locate 'Enter time against time off types not requiring booking'
Enable
this option.
Click on the Save button at the bottom to save the settings.