so i will not (and can not) tell MS project that labor is doing 100sf/day, or I have 500 sf of wall, and there is no way to tell this right? i mean i can not enter sf quantities there correct?

all i can do is, i tell ms project either a 2.5 day duration, and assign 2 full time labor as in 1

OR

i tell ms project that i have a total of 40 hours of work, and i assigned 2 labor to it, after which it calculates 2.5 day

am i correct?