While editing a blueprint I am using for doors, the editor has decided to delete every instance of those doors on my level, and at no point in my undo history did they reappear. So, now that I must replace around 60 or so doors, I tried to place the doors properly in one building, then duplicate them and re-attach them to another building that is a duplicate of the first. But the doors seem to maintain their world transform rather than their relative transform. I am unable to copy a building’s worth of doors’ properties and paste them to fix it. So, is there a way to just keep the relative transform when I attach it to something else? Do I just have to go through the tedium of selecting and pasting in the property matrix?
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Select the doors, CTRL+D to duplicate, then drag the whole lot to the other building 
Could also be an issue with the blueprint itself - if you keep having issues, share more details/screenshots.