Hello,
what i wrote previously was wrong.
Find below steps to follow to create explicit enhancement option (Point or Section):
1) be in change mode for object you want to modify,
2) populate access key to register object you want to modify,
3) put your cursor where you want to insert your enhancement (row 75),
4) click onto "Insert" button,
5) to create the extension, put your cursor line below where the line area was created (row 77), then right-click to get "Enhancements > Create":
6) populate pop-up displayed:
Regards.
Laurent.