As of now the CSV import feature does not support adding, editing or deleting time-off information.
 
Alternatively you can update time-off information by using the Import engine for the version of Web TimeSheet that you are using. You would need to create a csv in the specified format for the #TIMEOFFADD, #TIMEOFFUPD, #TIMEOFFDEL commands, this format is defined in the data import utility guide which can be accessed from the link given below.
 
https://download1.replicon.com/docs/wts/ImportUtilityUserGuide.pdf
 
Provide the CSV file to support so that they can import the data for you.