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In Arcmap I can render a layer with same symbolgy applied to different fields by way of re-importing the .lyr file and choosing a Value Field. How can I replicate this functionality in ArcObjects?

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Given an IFeatureLayer, "theLayer", one would cast to a IGeoFeatureLayer, then get its IFeatureRenderer and cast that to a IClassBreaksRenderer. Then it is a simple matter to set the IClassBreaksRenderer's Field to the field to be rendered.

IGeoFeatureLayer lyr = theLayer as IGeoFeatureLayer;fixed
IFeatureRenderer ifr = lyr.Renderer;
IClassBreaksRenderer cbr = ifr as IClassBreaksRenderer;
cbr.Field = "someFieldName";
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