Question about migrate vm to other datastore

Hi,

Just installed new VM and added old storage harddisk to this VM

OS:          [cluster_DS4700_san1] sms1a_W2K8R2/sms1a_W2K8R2.vmdk

Storage:   [cluster_SVC4700_san2] clone_sms1a_20140810/clone_sms1a_20140810_2.vmdk

               [cluster_SVC4700_san2] clone_sms1a_20140810/clone_sms1a_20140810_2.vmdk

=======================

I want to move those VM files to other datastore [cluster_SVC4700_san3] under new folder "sms1a"

I have tried to do it by right click VM then migrate, but doesn't have selection to change folder.

Please advice.

Thanks