Superposition with dependent sources
Do you mean CCCS (current controlled current source)?

The answer is to treat the CCCS as you would any other source acting alone, i.e. generating it's specified current, say \$kI_x\$, which is dependent on the current in the nominated path, \$I_x\$. You must not use the trivial solution, \$I_x =0\$ at this stage; doing so is a common error.