The issue creation properties control which groups are allowed to create issues in the projects using this workflow. For example, in the issue create properties shown above, anyone in the Project Management or Support Desk groups can create issues, but only the group leads of Development and Quality Assurance can create issues. No members of Client or Documentation can create issues.
There can be more than one issue creation box in a workflow. For example, you may have one main entry point where all users can create an issue but you may want a second entry point where only managers can create the issue.