I want to move my bath tub and the wall that the vent and drain are in about 3 feet so is it OK for me to "T" back into the original vent in the attic? Or does the vent need to go straight up through the roof and I need to drill anothr hole in the roof

The vent line does not have to be all vertical. Just pipe it back over to the existing line out the roof.

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Originally Posted by ssouther

i want to move my bath tub and the wall that the vent and drain are in about 3 feet so is it ok for me to "T" back into the original vent in the attic? or does the vent need to go straight up through the roof and i need to drill anothr hole in the roof

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You may tie back toa existing dry vent in the attic. This is called "reventing".
Good luck, Tom