These are generally utility functions which are generated with tha same name in different model. One option is that, you can generate these functions in separate file and use only this file. All model will call function from this file. To achieve this goto-
Configuration parameters> RealTime Workshop> Interface tab and select Utility function generation option as shared location.
Second and not recommended option is that, you can modify TLC file of corresponding utility functions to generate the function with unique name or as static. For example by modifying TLC you can force the RTW to generate functions with names like modelname_rt_GetLookupIndex. In this way function names will be different for different model names.
Best Answer