Hi @HusamS,
Welcome to the forum!
The way Asana handles relations is with dependencies
Subtasks are not automatically marked as blocking the main task.
You can add this relationship (easiest is through timeline) and this will enable you to auto shift dates for dependent tasks.
To request being able to link parent and subtask due dates you can add your vote here:
Assuming this solves your issue I’m marking this as a solution. If it doesnt, please let me know.