You can also create links by using the Link tool on the toolbar. Generally, it is only a matter of personal preference when determining which method to use, but in this case, using the Link tool does offer an additional benefit. With the Link tool, a user can select several tasks and create a linked chain of tasks with one mouse-click. This can make the linking of long strings of serial tasks much faster than using the mouse drag-and-drop method.
Using the Link Tool
Select the predecessor task first.
Hold down the Ctrl key and select the successor task.
Click the Link Tasks toolbar button on the Standard toolbar. Doing so creates the link between the tasks.
Did You Know?
All links created with the mouse or the Link tool (below) are Finish-to-Start links . If you want to change the type of link, you must edit the link and change its type.
Linking Multiple Tasks
Select a set of tasks in which each task will be the predecessor of the task below it in the set.
Select the predecessor task first. 
Hold down the Ctrl key and select the successor task. 
Click the Link Tasks toolbar button on the Standard toolbar. Doing so creates the link between the tasks. 
