Ok There is a major problem. There are the default caregories that come with the theme. If the category has widgets already pre-installed in the side bar, the customize shows the "Post Archives" section and I can edit the sidebar and add or remove widgets. If I would to remove all widgets and publish, the next time I try cutomize the category from Customize "Post Archives" will no longer be there. Now when I create a new category and even though I have chosen from the dashboard there to be a sidebar in the post collection like for example "List with Sidebar" for that category. Please help me, how to add widget in new categories when "Post Archives" is not there?