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I want to calculate auto increment a field name by group order Column "ID" into column "Name" in ModelBuilder and my input is shapefile.

Example:

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This can be achieved with a simple model and copying some prepared code from the help file.

Here is an input table, note that the ID column values are not necessarily sequential.

Sample data

The model is:

Model

The iterator is grouping by the ID field and the calculate field tool is set up as:

Tool set up

The code is found on the help file here

The final output is:

Output

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