Dynamic filtration in tree hirarchy I want a tree structure like below:
-parent1
 +child 1
 +child 2
 -child 3
  +sub child 1
+parent2
+parent3
...
 and when a user click on lets say "child1" then items in views related to them will be filtered.
How can I achieve this?Can any one please help me?
Did you try Simple hierarchical select module. You can build your tree structure with Drupal taxonomy.

Unlike Hierarchical select this module provides a simple widget for taxonomy terms only. As an addition Simple hierachical select works as Views exposed filter.