I need to display all categories in left side and display all products list in the right side when page is loading. When you select check box for any one category, then refresh it and need to display products based on the selected category. How can I do this?
Go to admin->Catalog-> Manage Categories->edit category->Display Settings->Is Anchor set to yes.
Set is anchor for all category so it will display all sub category of current category in left side.