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I want to take a DEM and edit it using a tool in ArcMap where it will take all the areas above a certain elevation and lower them all to the elevation I choose. For example, I would want everything above 2000 ft to be changed to 2000 ft so that it is flat at those areas. Any ideas on a good tool to do this?

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    Please edit the question to indicate the version of ArcGIS in use, and whether you have access to the raster editing capabilities of the Spatial Analyst extension. – Vince Mar 19 '16 at 21:07
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    Welcome to gis.stackexchange! Please note that a good question on this site is expected to show some degree of research on your part, i.e. what you have tried and - if applicable - code so far. For more info, you can check our faq. – underdark Mar 19 '16 at 21:14
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You can use the "con" tool for reclassifying values in rasters. The conditional statement is the bread-and-butter of raster analysis and is a good thing to be familiar with.

The con tool can be found in the ArcToolbox: Spatial Analyst Tools > Conditional > Con

You can also do this via the raster calculator which, is my suggestion because you can define much more complicated conditional statements. Using raster algebra, a conditional statement takes the form of an IF/ELSE statement [IF elev >= 2000, THEN 2000, ELSE elev]

The raster calculator can be found in ArcToolbox: Spatial Analyst Tools > Map Algebra > Raster Calculator

The syntax for your question would be: Con("dem" >= 2000, 2000, "dem")

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