BPMN sending task a second process

I have two Processes that have none start events (Forms to start processes).

One of the processes needs to send variables to start another process and then end. How do I model it? From what I understand is that a BPMN can only have one non start event.

One way is to create an API call from one process to another but I am hoping there is an easier way.

Thanks
First time Camunda user.

You can use a Call Activity to start another process.

@Niall Worked like a charm, thank you.