Why do I need to export/import to linked models separately?

This is a Revit^® rule, not an Openings Studio^™ limitation.  When working in Revit^®, if you want to make a change to a linked model, you must open that model itself to make the change.  The same is true for exporting/importing.  Unlike analyzing, which only extracts information from a model and its links, exporting/importing makes family and/or parameter changes to the models.  Therefore, each one must be updated separately. Make sure you export the Shared AAOS hardware set parameter.