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.
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.
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.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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