Dennis @ PerfectForms
I think you are saying that you want to open specific instances of another form. If this is the case you should use the Show Form object and specify the Instance ID of the instance you want to open. Typically I use a form connection to get the Instance ID I need.
I encourage you to watch our free training video on Parent Child relationships which will help you understand the Show Form object: http://www.perfectworkflow.com/TutorialVideos/V2/Parent_Child/Parent_Child.htm