@Steven Behnke
Hello Steve...As you ask I've created the topic on Atlassian answers.
So, may be you can help me. As we know Service Desk is not mature and we have to create somme tools with allow to create correct issue linked with the ticket and to floww their transitions
Create the linked issue.
If you want to create an issue link in service desk you have to use their create linked issue dialog...but it is not operationnal...very limited.
So I asked to adaptavist support who told me that internally they don't use this "create linked dialog" because it's so limiting, instead they use https://scriptrunner.adaptavist.com/latest/jira/fragments/CreateConstrainedIssue.html with a behaviour that copies whatever fields we want from the linked issue.
And it works...but you can't change the project type or the issue type in the dialog box...So I had to create as many buttons as need in the menu "More" of the issue. Too bad. I've asked to the adaptavist support...I'm waiting their respond.
Automation and transition
My second problem is to be able to put a comment in the parent issue (Service Desk) and to transition it to resolve when the linked issue is closed. Unfortunatly the automation system in Service Desk doesn't work...so they've created a bug for me (JSD-4357) witch will be fixed in the 3.3.0 version.
So I've decided to search how doing it...and I've created Adds a comment to linked issues when this issue is transitioned poste function in my workflow...It works but for all my project...I would like to put a comment in the linked issue only if this type is Service Desk
QUESTION 1 : According to you is it possible when a issue is transitionned to status closed :
- to add a comment to linked issues, if these issues belong to a projet type or issue type ?
- to transitione these linked issues to resolve, if these issues belong to a projet type or issue type ?
If you can help me Steven...it will be great 
Best regards, Olivier