Follow the steps below to achieve your goal of embedding c++ code in another project:
1. Generate Code using GRT TLC.
2. From the generated code, create S-Function using S Function Builder.
3. Step 2 will create MEX file.
4. Use this MEX as S-Function in the model you want to use.
However, in case you want to call the generated MEX from c++ code (instead of Simulink Model), go through following document link: Call_Function
