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I see CopyFeatures_management, but this creates a new feature class.

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//001700000035000000

Is there a way to copy features from a feature class into an existing feature class?

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You want to use the Append_Management tool.

If you know the attribute tables will match up (including data type), use schema_type NO_TEST anyway (even though the documentation would suggest TEST). If the attribute tables do not match up you will have to deal with field mappings, which can be a huge pain in arcpy. (If you are using NO_TEST and a subtype, make sure that you pass in None for the field_mapping argument.)

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