In Task List, choose a task list from the Internal option if you want to display the task only to your portal users. However, if you want to collaborate and display the task with client users, you must associate a task list from the External option.
Users can set the default billing type for tasks by adding the Billing Type field in the task layout and fields. Billing type can be, None, Billable or Non-Billable. If the user selects None, then the default billing status of the project will apply.
To set duration for a task instead of end date, click Enter Duration and enter the number of days in Duration.
If the start date of the recurring task occurs on a holiday or a weekend, the previous working day is automatically set as the start date. This option is enabled only if the recurring frequency of the task is set to Monthly or Yearly.