how to automate a proces of converting sub-task into bugs?

[qba]

I have a challange in my organizations - need to automate one proces. 
Every time when sub-task is created - I need to convert it to BUG and add some special fields. Adding special fields is not a problem but cant set a triger for converting a sub-task into BUG. Thank you for help.  

[Akriti Sagar]

Hi qba

Thanks for your question.

You're right—Jira doesn’t allow changing the issue type (like from Sub-task to Bug) automatically using built-in Automation. But here are a couple of ways you can work around it:

Option 1: Use Automation + Clone
Since we can’t directly convert a Sub-task to a Bug, we can automate cloning the Sub-task as a Bug, and then delete or close the original sub-task.

Steps:

Go to Project Settings > Automation.

Create a new rule:

Trigger: Issue created

Condition: Issue Type = Sub-task

Action: Clone issue

Set Issue Type = Bug

Add your special fields here

(Optional) Add another action to Transition or Delete the original sub-task

This way, every time a sub-task is created, a Bug will be automatically created with the same content + your custom fields.

 Option 2: Use ScriptRunner or Other Apps
If you're okay using a Marketplace app like ScriptRunner, you can write a script to change the issue type directly. This is more flexible but needs admin access and scripting knowledge