San. Sewer labels

Is there a way to automatically label the plan part of the sewer with
manhole No.s, rim and invert elevations? Should the plan part be drawn first
and then used to create the profile or the other way around? Why, when you
enter use mh center and type in the slope you want does it slightly change
the slope to something smaller, i.e.: .40% to .39%? and how can this be
avoided?
manhole No.s, rim and invert elevations? Should the plan part be drawn first
and then used to create the profile or the other way around? Why, when you
enter use mh center and type in the slope you want does it slightly change
the slope to something smaller, i.e.: .40% to .39%? and how can this be
avoided?