I have created a new project. Q: How to make an existing task a sub task to a newly created task?

Scott Stephenson_ba8nzm

I have created my first jira project. 

Q: How to make an existing task a sub task to a newly created task?

Thanks Scott

Mesut Yilmazyildirim

You can convert multiple tasks into subtasks via bulk issues

For doing so, perform a search > bulk change > Move Issues.
Move into the same issue and change the issue type to sub-task.

It will also ask you the parent issue that it will be linked.

Hope it helps.