Magento Hide only particular category from left Navigation

Magneto Show Category on left side as but some time we require to hide particular category or subcategory
so we can remove just open the following file

Magento show subcateogry instead of Products in grid/list Page

Magneto Have default functionality of showing the Products in list view or Grid view
But some time we require to show the Sub catgeory in list page and if that sub catrgoy have another subcategory

For showing that we need to work on following