I want to create a template that has dependent tasks with a start date in the first task and all others’ due dates will just add days or weeks based on the first task’s due date.
For example, “Task 1” start on a 'given date". “Task 2” depends of “Task 1” and it is due after 5 days. “Task 3” depends on “Task 2” and it is due after 10 days from “Task 2”. And etc.
When I create a new project from the template, I want. set the due date for “Task 1” only and all others will be based on this due date.
Unfortunately Asana does not provide this functionality.
Fortunately 
I’ve created an Asana integration, Flowsana, which does give you this exact capability. See this forum thread for more info. The functionality you want is the Flowsana “Dynamic Duration-Based Workflow”.
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