How can I trigger a task on competition of a task

How can I trigger a task on competition of a task

I want to trigger 3 other tasks on completion of a particular task and so on.
Sometimes 2 tasks got triggered by completing of one task. 
But I can't find any particular setting to manage that.
As well as the project statuses are useless at I have to manually go and edit the status of a project. It should be automatically updated on the basis of progress.

Main this is, let me know how to trigger 3 other tasks on completion of a particular task. 
PS: Don't tell to add dependency.


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