Hello,
if you mean how to reuse directly a model written in the Python API, you can export the model as a .cpo file. See the function export_model():
https://ibmdecisionoptimization.github.io/docplex-doc/cp/docplex.cp.model.py.html#docplex.cp.model.CpoModel.export_model
Then you can import the model, for example in C++, or even simpler in the binary cpoptimizer that will allow to execute directly a .cpo model.