In the old times of ArcMap or any other GIS Software, storing the statistical classification from the symbology setting usually takes efforts of repeated query and field calculations. For example, classifying population attributes using Natural Breaks/Jenks classification method can only be done onthefly.
The classified values are not saved in the attribute table, so, if we want to use the classified values, we must repeat the classification. In certain cases, this will cause some difficulties when we need to share the analysis to other party. Fortunately, ArcGIS Pro has this builtin geoprocessing tool
to handle this kind of task in very fast and easy way. The tool is called Reclassify Field, and here is how to use it.

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