Creating links in process chains

Hi, I'm new to BW so please forgive the silly question. In process chains I have created a start process which launches an infopackage for data loads which then launches another infopackage for texts loads. Everything is good. However now I created a new attribute change process which includes multiple infoobjects. I cannot for the life of me 'create' a link between this new process and the existing ones. My problem is simple, how do I create a link from one process to another where no link previously existed? I've reviewed past questions but unless there is an existing link that I can drag to the new object it seems to be impossible. Some of the SAP BW pdf docs that I read made mention of "drawing lines" to connect the processes but no other detail was given. Any help will be appreciated.

Thanks in advance,

Kevin