Hi @SD_10636834
What do you mean apply business process ?
Windchill has own processes and you can use OOTB configuration or design own processes and workflow.
Also you can use code in the workflow to call methods that communicate with other systems,
The methods usually does not exists with not supported systems but you can create own. You just need a customization knowledge.
You can try to check the Windchill REST API how to communicate with Windchill from outside places.
or you can write own Java method to communicate with other nonsupport systems .
How to create own java class
I usually write own classes that I can integrate whatever you can imagine.
PetrH