This can be done by linking the sub-tasks when they are created to the "Most recently created issue" (in this case, the previous sub-task).
Note. You need to use the full "Create issue" action to create sub-tasks so that you can edit other fields.
You rule will look something like:
Hey everyone! My name is Sarah Schuster, and I'm a Customer Success Manager in Atlassian specializing in Jira Software Cloud. Over the next few weeks I will be posting discussion topics (8 total) to ...
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