Subtask usage in Sprint

[Duygu Kahraman Kosmene]

Hi,

I am working first time with Jira. When I was using in Azure I was using Epic > User Story> Task in structure way so I followed the when the task is finished I can close the User story or I could assigned the task different sprints.

But in Jira, Task and User story are sibling. They are at the same level. I started to use subtasks to define actions for hierarchy. My problem is when I assign a User story in a sprint, all subtasks assign to same sprint. You can not close the sprint without finish subtasks or you can not assign subtask to other sprint.

Is there any solution for it. Should I use subtasks or not. I am quite confused it. Can you give any recommendation , please?

Thanks 

Duygu