Project Module

Hi, I have a query regarding Project Module: For a particular project if i go to Activities button in “ProjTable” form.I m getting one Hierarchy form , in that i have to create individual activity. When i create activity activity number is generating through number seq. I have customized one table in that i m having three fields (list of activities) “ProjActivityId” , “Description” , “SerialNum” and the same fields r designed in form. Now what my requirement is…??? Client is saying that if he clicks the activities button for a particular project all the list of activities should come under tab “tree” in tree structure inside the template…