Start Process Smart Service

What do you mean by  use or access , Start process starts child process asynchronously , you can initially pass data . But you can't maintain the relationship. Can you tell more about What you want to know. In Child process you are not getting data??

https://docs.appian.com/suite/help/24.1/Ways_to_Start_a_Process_From_a_Process.html#comparing-ways-to-start-a-process-from-a-process

I don't undestand...whwn you execute an start process, the child is exceuted in async mode, but it contains the parameters passed...

You create a process variable in the child process and configure it as a parameter. Then create a dictionary using the exact same names to pass data when starting it.

Hello [mention:df4bb06d128f422985b199c76093563c:e9ed411860ed4f2ba0265705b8793d05] 

I hope what you want to ask is one of these

Q1. how to see the instance of the process that you have triggered in the start process. 

Q2. How to use the data that is passed from the parent model in the child process.

A1. If that is your question you can view from the process instances tab of the Process model that you have used in Start Process Smart Service. Else you can view it from the Monitoring tab of the Application. 

A2. If it is the data, Then you need to create a process variable and configure it as a parameter in the child process.

Please elaborate the question with more details for faster and correct answers.

Just in case you're really asking this at face value (and not trying to ask something more complicated / subtle) - you'd use / access the value, in the child process, just like you'd access any other PV value in any process model.