Stage Dependency
The Stage Dependency constraint is used to rank stages in a mining order.
In the example below, Stage 10 must be mined completely before Stage 20, and Stage 20 has to be mined completely before Stage 30. 
To create a dependency:
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Click on the stage that should be the preceding one.
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Click on the white circle that has appeared.
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Drag the arrow all the way to the circle on the stage that you want to be the dependent one.
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Release the mouse. The dependency will be created.
The functions provided on the viewer toolbar are: 
Auto layout diagram, 
Size diagram to fit, and 
Clear dependencies.
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To order the stages in your view, click
Auto layout diagram. The stages will be aligned in their precedence order.
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To place your diagram in the centre of the viewer, click
Size diagram to fit. -
To remove dependencies, click
Clear dependencies.
Tip! To remove a single dependency link, use left-click + Delete.
