Need to shift a permutation (1,2,3)(4,5)->(6,7,8)(9,10)
So I've been trying to shift a permutation group upwards to be able to make a cartesian product of two arbitrary permutation groups into a permutation group. My idea was to simply shift one permutation group up enough so that it commutes with the other. However I am stuck trying to figure out how to shift it up, i.e. add 5 to each number in the permutation. Anyone have any ideas?