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Instructions provided are to append feature classes that have different schemas. The Append function in ArcToolbox > Data Management Tools > General > Append does not append two or more like feature classes of different schemas by default. It is necessary to specify the schemas of all the feature classes involved, in the new output feature class.
The following example uses shapefiles, but any feature class (shapefile, personal geodatabase, or SDE geodatabase) can be used. Create a new shapefile that stores the output of the appended shapefiles. Match the schema of this shapefile so that it matches the schemas of the input shapefiles, by following the steps below: