Default Internal memory

Some one plz tell me how to free internal memory which is just 400 mb now and to move apps to memory card....
Is there any method to install the apps to sd card n
Link2sd or any other method ????
...memory card ain't partitioned. ...

Using DN3 rom.

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SeNt fRoM a mEnTaLLy cHaLLeNgEd xPeRiA