How to active another BPM or import another BO when method is called

I have two BPM. one in Erp.CustShip.GetMainfestInfo, another in Erp.LotSelectUpdate.GetNewPartLot. How can I link them?
if the first BPM is called. then active the second BPM.
Do I have to hard code to trigger another BPM?
Also, it is better that if it can pass some parameters.
Thanks

What do you mean by “link”?

In your BPM on GetManifestInfo, if you call the LotSelectUpdate.GetNewPartLot method using a connection to the service, your other BPM will execute along with the base logic (unless you’ve replaced the base logic).