its hard to say with out looking at it first, what would the thickest and thinnest portion of the new cement be. if your talking inches yes it could be done as long as you paint on a cement bonding agent before you install your cement. there is also a product for smaller thinner issues i have had my mason use for leveling out basement floors. self leveling. you will have to seal the inside of your forms for this as it will drain out. because of its loose consistency. another thought if you are looking for color match, no mater what process you use it will not match other surrounding concrete surfaces, as for walkways, steps. BOB.