SonarQube Rules - Changing the Issue Type and Severities

Thanks for the clarification. Checking on designing Custom rules for Cobol. Hence, exploring on all the possible as well as not possible scenarios before starting. I was going through the below page regarding the same topic. Hence, wanted to confirm the same.
How to change the type of a Rule? E.g. from Bug to Code smell - SonarQube - Sonar Community (sonarsource.com)