Not possible to move folders

Hello,

I'm a MAC User using LR 6.7

I'm using a NAS on which my pictures were stored under a shared volume (ex: Volume/Photo1)

This was visible under Lightroom as follow:

Folders:

Photo1

     Photo1

         2016 Apr 1

I just bought a new NAS on which i want to transfer my photos hence using Ligthroom to make this move.

Question: How can i add the new "Volume/Photo2" as a folder in Lightroom?

The above question may appear a simple one but when i tried "Add a Folder" in LR i got the Import interface which is not what i want

I tried importing new photo to this new "Volume/Photo2" which resulted in the following structure :

Folders:

Photo 1

     Photo 1

        2016 Apr 1

        ...

Photo 2

     2016 Apr 2

from there i tried moving the folders from Volume/Photo1 to the new destination but..... i can only move the folder under the sub-folder on the Volume/Photo2 created while importing new photos....

in other words i would like to have

Folders

     Photo 2

         2016 Apr 1

         2016 Apr 2

and the only thing i can do is

Folders

     Photo 2

          2016 Apr 2

               2016 Apr 1

Which means adding the folder from Photo 1 as a sub folder of Photo 2 / 2016 Apr 2.....

Somehow i'm stuck and did not find a way to easily add a folder to my LR catalog and move everything i had on a different location to this new one....

Please help

Thx

Chet