I am trying to see what are the best practices and how to link service desk ticket with a bug ticket internally created for the software team.
You can just link the issue as usual and then setup an automation rule to create comments on the linked issues. Apart from comment you can also transition the issue if you want to automate further.
You mainly need to create an automation rule with branch: For Linked issues (of a specific type)
You can access the comment body using a smart value {{triggerIssue.comments.last.body}}
I explained in detail how to create this automation rule here.
I hope it helps.
Ravi
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