Do Sub-Processes inherit the Characteristics of the Main Calling Process (Latency/Process Mode, allow simultaneous executions)?
A subprocess called by a low latency process always uses Low Latency mode. In other words, the subprocess’ settings in the Process Options dialog are ignored and it uses the same Process Options settings as the top-level low latency process that calls it.
Allow Simultaneous Executions
When a process calls a subprocess, the subprocess always executes immediately, regardless of how the Allow Simultaneous Executions check box is set on the subprocess or its parent process.
Please see the documentation at this link for additional information pertaining to Process Options: