Create the draft as split at sketch, one half will have 0 degrees draft. This does create a mismatch between the parts. Otherwise create a protrusion as a blend around 4 sketching planes to have matching surfaces.
thanks donha, i tried ur option of split at skt it worked in few places. I actually want to draft a round which i have created on an edge of a rectangle block thats all I want to do but it is getting resolve. i tried ur idea but still i couldn't get it. thanks for replying.
Can you post a picture of what you are trying to do? you can create a draft split using a datum curve as the driver, then pick on side and a ref plane, this will split your part only on one side of the cylinder.