Are the subtasks that you want to create always the same?
Do you use information from the parent issue?
Can you give a little bit more info about what you are trying to do!
or try looking at https://marketplace.atlassian.com/plugins/com.codebarrel.addons.automation/server/overview this will probably solve your problem!
With the plugin from my link it should be possible to create it.
Basically you need to create a screen that asks for all information for the issue you are creating + all information for the sub task.
With the plugin you could then create a rule that creates the new subtask automatically when the issue is created. in the rule you can define wich field should be filled with information from any other field from the parent.
The automation plugin is really easy to use!
I'm i making any sense?
as @Sebastien Jacques wrote, it is not possible with plain Jira. But you can do it e.g. with the Jira Workflow Toolbox app.
This one provides you with a workflow post function "Create issue and subtasks" which you can use in your "Create issue" transition.
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