Can you be a little clearer about what you're trying to do please. Are you wanting to to know how to position the corrugated sheets onto the existing roof, or attach them so become a single object?
Also, whichever you're trying to do, this is a modeling question, not an issue related specifically to Max2013, therefore I've moved this thread to the more appropriate Modeling forum.
Max 2016 (SP1/EXT1)
Win7Pro x64 (SP1). i5-3570K @ 4.4GHz, 8Gb Ram, DX11.
nVidia GTX760 (2GB) (Driver 430.86).