You can make that customized window a Favorite and repeat it from the Favorites palette, or you can eyedropper it and then place additional instances.
As far as changing all instances at once, you would need to select all instances and then cmd(ctrl)-T to change the settings of all at once. Use Find & Select to select them all, after having assigned some common value to a searchable (by F&S) parameter. If the windows exist on only one story, then do the F&S on that story as one option. But, in general, where the window could be anywhere, do the F&S in the 3D window to select all instances regardless of story.
You cannot simply select one instance and hope that the other instances will change. All instances must be selected first, then any changes in the settings dialog will equally affect each one.
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