Yes, you can convert multiple tasks into subtasks: https://jira.atlassian.com/browse/JRA-13245
For doing so, perform a search > bulk change > Move Issues.
It is a little bit difficult to find, as logic seems to say that it should be categorized as an Edit Issues operation instead.
Hope it helps.
Step 1: Search for the tickets from issues -> search for issues
Step 2: Select search criteria
Step 3: After getting the desired tickets list, click on three dots at the right corner and select move
Step 4: In next step follow the instruction to convert ticket to sub task.
To have multiple issues converted to sub-task, you can use Bulk Operations. Please note that when converting multiple issues, all of them will share the same parent issue.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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