I assume you are talking about scheduling doors and windows.
And by openings I assume you mean empty doors and windows and not the new opening tool.
As the empty doors and windows are actually still door and window objects, you will have to differentiate them from the other doors and windows.
If they are actually separate objects then you can filter them in the schedule criteria by object name.
Otherwise you can do similar filtering in the criteria but by using the Element ID.
So long as you empty openings have something unique in the ID that will allow you to filter them.
i.e. change their IDs to "dont_schedule" and in the schedule criteria you set it to ... Element ID - Does not contain - dont_schedule.
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