i'm doing a road project. i've got profile grades of existing left and right ditches. in some sections we're redoing the ditches so i've got proposed left and right ditch profiles. what i want to show is where i've got proposed ditch grades, i don't want to show existing ditch grades. the new ditches happen intermittently on the road so i would need to be able to turn off the existing ditches at various places. is this possible without exploding my existing ditch grades? thanks.