There are two types:
Manual Dependencies
Automatic Dependencies
Only one type can be used at any one time, and you can switch between these at any time to easily manage your schedule.
See video on Scheduling which also covers the dependencies:
Manual dependencies
This is the default setting. When manual dependencies are on you'll see the following things:
You can set manual links between tasks by dragging the dot at the end of one task to the start of another task, as shown below
When you move a schedule item, ONLY that item and the one linked to it moves
Automatic dependencies
To turn on automatic dependencies, click on the cog menu, and choose ''Automatic Dependencies" from the list. See image below. To switch back to Manual, untick this in the menu
When automatic dependencies are on you'll see the following things:
When you move one item every item BELOW it moves with it
There is no ability to have manual links between tasks