While selecting Group/Owner for the task, you have the option of either marking (or) assigning the task to the technician.
Marking Task(s) is a way of associating tasks to technicians that helps the administrator plan tasks in a better way
Marking Task(s) is an administrative activity that the technician never gets to know until the task is assigned to him/her
Marking Task(s) helps administrators to allocate 'marked tasks' to technicians 'only when it is time' for the task to be executed and not unnecessarily in advance
Marking Task(s) is especially useful for dependent tasks that heavily depend upon the completion of the parent task. Under such circumstances, the child task can be marked with a technician and can be later assigned to them based on the real-time completion of the parent task
Marked tasks do not appear in the respective technicians My Tasks list (but only serve as a reference for the administrator) until the task is triggered.
Whereas Assigning Tasks to technicians will directly intimate the concerned technician about the task assigned (through notification) and will be listed on his/her My Tasks list.
To mark a task to technician/group,
Click the
icon to mark a task.
The
icon will appear beside Group/Owner fields indicating the task is marked.
Choose Group & Technician to be marked with the task.
Save the task.

To assign a task to a technician/group, do the following:
Click the
icon to mark a task.
Choose Group & Technician to be assigned to the task.
Save the task.