Trying To Duplicate object then move

Hi all I am stuck again and your input would be greatly appreciated. I am doing the Blender Environment Artist: Create your own 3d Game worlds course. I am up to Lecture 8.4 where Grant is discussing how to create different sized roofs. I have attached a few screenshots of my problem. He selects all of the roof then Shift D to duplicate then moves it along the X axis. When I attempted this I selected all the roof, A, then Shift D to duplicate then G then X to move it all. Instead of moving the roof as one to the side the parts of the roof all moved in towards the other. I do not have Proportional Editing on. There are mirror modifiers on the beams and he said not to apply them now as it would be useful to have these when creating a new roof.



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What are all your separate original items mirroring around?

Did you include a copy of that?

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First, make sure you are in object mode and not edit mode. Second, you don’t need to press g. After you do the shift+d you will already be in move mode. So just have to press x and then move it. Third, as @NP5 mentioned, make sure if you are pointing to an object in the mirror modifier make sure to change it to the duplicate of that object. It will be the same name with a period and number added to the end.

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Just in case, if you still have weird results after all what @Dwayne said, check that you have all the transformations applied before duplicating the objects with mirrors (ctrl+A and then at least rotation and location).

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Thank you NP5, Dwayne and Megane_Wang for your replies and help. I have decided to re-watch the earlier videos on creating the roof and start it again to try and work out what I have done wrong.
Regards
Ann

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I use an EMPTY object to be used as the center point of a mirror modifier.
Place this empty and the object in a collection, and duplicated linked the collection.
but that said, Grant could use a different approach. (I didn’t do that course).

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