How to create a new sub task name "Sub bug", so that I can add the sub bug to the story?

[Khanh Hua Tran Thuy]

How to create more sub task 

[Dave Mathijs]

Hi @Khanh Hua Tran Thuy welcome to the Atlassian Community!

Yes, the default Jira hierarchy allows for custom sub-tasks.

You can create a new custom sub-task and name it you like.

Then add it to the Issue Type Scheme and Workflow Scheme and all associated projects will have a custom sub-task available as child of issue type Bug.

See Configure sub-tasks for more info.

[Sanjog Sigdel]

Hello @Khanh Hua Tran Thuy Welcome to the community.

You can create a sub-task from here:-

Remember to select Sub-Task Issue Type (Level-1) in order to create sub-tasks.

After creating the sub-task, donot forget to include that issue type under the workflow scheme to associate with the projects of your need.