Use the Opening list dialog to:

At the top left of the dialog is a list of defined openings of structure elements. These openings will be presented on the selection lists of openings. When you select an opening from the list, a schematic drawing displays with characteristic opening dimensions.
Use the icons in the dialog to:
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 Create new - opens the Opening definition dialog where you can define a new opening. The opening is added to the list of available openings in the current project.  | 
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 Modify - opens the Opening modification dialog where you can modify parameters (such as name and dimensions) of a selected opening.  | 
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 Delete - removes a selected opening from the list of available openings in the project.  | 
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 Save to database - save the opening to an external database file.  | 
The options on the expanded dialog:
To add an opening from a database to the list of openings available in Autodesk AutoCAD Structural Detailing - Formwork Drawings, click 
 (Add). The opening will be added to the list at the top left of the dialog.