In the EPC model (higher level) I have a function which is needed to be explain in more detailed steps. In this case is it correct to create another EPC model (lower level) as an assigment on the Function?

In this case what object is using as a start and end point, considering that when the process in EPC - lower level is finished, than it countinues to the next function of EPC higher process.

Thank you in advance for your answer.