Question about process pointer in BPM

Hello to everyone,

I'm haven't much experience in BPM modeling.

I'm trying to model a commissioning BP.
The start event is the arrival of the picking list.

the BP goes on...with some other funcions and events.

At some point should be an arrival of goods form the goods input.
I guess the right element to use is a process pointer.

Now comes the question: How can I logical integrate the process pointer?

Is my solution technical alright? Or isn't it allowed to integrate the way I did?
Can I integrate a control flow who comes from the outside?

I'm so sorry for my terrible description. I'm quite desperate.

If someone speaks german and willing to help  I will explain it again.

Thanks a lot!