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How to select both halves of sphere

Our design guy sent me a CAD model and of the features is a sphere, but it is in two halves, so two separate surfaces. Something about how he drew it, it ended up that way and when I asked if he could stitch them together into one continuous surface, he said that the current version of his software didn't support that. So my question is, is there any way to select both surfaces of the sphere so that I can do a sphere autofeature?​​ I've tried using Ctrl or Shift and clicking, but haven't figured it out yet.