copy/paste works fine.. if PI has it, use grids and lockink guides to ensure they are horiz/vertically aligned (if you are going after that look). With PS, this is easy since you can setup the guides and lock to them.. Also, if you can use layers and link them, you can duplicate and then just slide them down evenly.. agian, easy to do in PS, but I"m not sure how these things work in PI.