Sync Between different lists on Dashboards

I have two Dashboards with modules on them using different lists. Dashboard 1 module has list l1 which has many levels of Hierarchy and the other module in Dashboard 2 has list l2 which is made out of the lowest level of hierarchy of list l1. Now what I want is that if I choose a certain list member in the module element of Dashboard 1 by clicking on it this should sync across the the other Dashboard.                                                                                                             for ex: if Iist l1 has A as list member and B,C,D (children of A) are list members of l2  on clicking on A in Dashboard 1 and then moving to Dashboard 2 I should see B,C,D in the module element which uses l2 list. Thanks