From here you can add/manage design idea category/subcategory

• Add Category To
  Select category option from here. Select "ROOT CATEGORY" if you want to add the category as root category OR select "Other" if you want to add the category as a subcategory. If you select "Other" it will open the category selection window, under which category/subcategory you want to add the new category. Select your option as you need here.
  
  
• Category Title
  Enter category name
• Category Alias
  Enter category alias as you want to see in front-end design idea page category URL
• Category Description
  Enter category description
• Active
  Check this option for active/inactive this category.
• Order
  Category order by
• Category Image
  Browse/select category image. It will automatically upload the category image when you select the file. This is not mandatory.
• Add Category
  Click "Add Category" Button to add your new category.