Passing a value from one JasperServer input control to a another input control

[bluvulture]

I need somehow to achieve levels of hierarchy in a input control. For example a user needs to select a certain organization, and every organization has some sub organizations and if he selects organization in a drop down I need to show all sub organizations of the selected organization, and I have to leave a possibility when an organization is selected to select all sub organizations, or just one. Likewise, a possibility to select all parent organizations must be there.
How to acheive this, I have explored almost all of my options and I'm thinking hat my best bet is to make my own JSP page with parameters, is there any other way to achieve this with already incorporated input controls in Jasper server?
I'm curently using Jaspersoft Studio 5.6 and Jasper Server P.S. a list of parent organiations and their IDs is filled from a query, it's not hardcoded. Regards