Hmm.. Sounds like the option was disabled on the phone. Can you try using 3rd party apps like Link2SD (link)?
their is no such option in panasonic p55. i am also searching for an app to move my apps from internal memory to sd card
Hi mehmood! Try going to Settings > Apps > tap an app > check if there's an option 'Move to SD card'.
Let me know if that works.