Create a sub-task for every user in a User Picker field and assign every newly created sub-task to a different user. In addition, add a custom summary to every sub-task depending on the assignee.
Issues to be created
Choose Multiple issues.
Enter the following expression with the parsing mode set to Text list.
The number of list elements defines the number of issues to be created.
Choose Selected issue type.
Specific issue type
Choose Current issue.
Enter the following expression with the expression editor in Advanced text mode:
The summary of the sub task will vary for every user.
If you need to modify the summary for the issue assigned to user.two, you should edit "Summary 02", that is, the text in the same position in the text list as the text in the first text list.
Select the field Assignee
Select Set field value manually (parser expression)
Write ^% in the expression editor in Advanced text mode to retrieve the seed text.