Yes, an outlet has a connecting "bar" in the middle. This connects the upper 1/2 of the plug with the lower 1/2. Just cut this bar,right in the middle. Then the top 1/2 would be wired to the top--the bottom would have a different wire connecting it to it for just the bottom. They would share the same grounds,as there is but one ground screw.(You could pigtail the grounds together) i.e. wire nut the grounds together along with a third wire that goes to the receptacle.
two dedicated lines into one duplex outlet
i am setting up 4 dedicated lines; two 20 amp and two 15 amp. I'll be using Hubbell 5362 outlets. Can i place individual lines into each of the receptacles? Can the ground be isolated for each line on a particular outlet or the two lines on that outlet would have to share the ground? Does it matter? Should i keep the same amperage lines on the same duplex outlet? I'll be using 10/2 and 12/2 romex for the 20-amp and 15-amp lines respectively. Thanks for your input!