Change portion of DEM using a second DEM.

Question

I am an old GIS user (20 years since serious GIS usage) but new to ArcPro.  I am trying to create a DEM which will show the expansion of a gravel pit.  I have a 10x10 DEM of the extent area and two feature classes, one of existing gravel pit and one of proposed pit expansion area.  I want to show what the gravel pit will look like after it is expanded.  The I want to show from a view point what you would see after the pit is expanded.  I have tried several approaches, raster calculator with a DEM created from the expansion feature etc.  I am floundering and feel I need a new approach.  Any ideas?  Thanks in advance

Hosmank · Accepted Answer

Thanks for the response Robert.  I figured out a work around by converting rasters to polygons, then merging polygons and finally converting back to rasters.  There was also some database manipulation and extracting etc.