Tutorial Step 14: Splitting Tasks
If a resource begins work on a task, but needs to finish the rest later, the task can be split to continue at a later date. For example, if you begin sorting a pile of paperwork and need to pause to go to a meeting, you can split the task to indicate that a portion of the task was completed.
To split a task, select the task in the outline. Then, from the Structure Menu, select Split Task. In the popover, enter the amout of work completed, click the Split Task button and the task is split for later completion.