How to get more artifact types in module editation menu

Check out step 6 in the below document.
https://jazz.net/help-dev/clm/topic/com.ibm.rational.rrm.help.doc/topics/t_create_artifact_type.html

If you selected Module as the format, in the Preferred Module Content field, select multiple artifact types to use and specify how they are ordered. When other team members add artifacts to modules, the preferred artifact types are shown by default. You can change the order of the preferred artifact types or remove them. The order of preferred artifact types is used in several menus:

• The menu from the blue Create button
• The artifact row menu
• The Type menu on the inline editor toolbar for modules

If you have the JKE Banking sample project installed, see the artifact type Use Case Specification as an example.