Subscribe from bpm

Am new to webmethods. can anyone help me in this scenario.

I have a business process which is used to process purchase orders from different companies.Here i have to subscribe more than one document, but as of now i know to subscribe from Receive step only that to only one document. Can any one guide me how to subscribe from my Business flow activity step rather Receive step.



You can subscribe a document from activity step using input/output properties of that activity.

In this input tab you will get the document from the receive step and if you want to choose another document please rename the document name in that tab and you can browse another document from IS.