"To manually construct an opening using a previously placed compound cell"

"To manually construct an opening using a previously placed compound cell"
is a subject in the CEU3 help. This leads you to "Construct Opening in Form (using a shape)" page.

However the pull down does not include the "Construct Opening" entry shown in the help. Where do you go to get this to show?

The search ribbon won't find this either--searching for Construct Opening yields nothing. Openings takes you to placing an opening dataset object, which is not the same thing.

How to access this command?