I have pp2014 but I'm under the impression the morph tool is the same in both. I was able to load up M4 and one of his left ear morphs. I then opened the morph tool. On the create tab, click on the drop down menu where it says custom morph and find the morph you're working with. I then went down to the mirror buttonand chose Head: -x to +x. Now the left ear morph move both ears at the same time. You could probably use the left to right (or right to left) options. I just used the other.

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I use Poser 13 and win 10