Step 1 – Create a new Post (from the wp-admin dashboard)
Step 2 – Expand the Categories parameters
Step 3 – Create the New Category
You can give the new category a name.
If you select a ‘Parent Category’, the category will become a sub-category of that category.
When done, click the ‘Add New Category’ button
Step 4 – (Optional) Adding the Category to the home page menu
The category will appear under the ‘Menu Structure’. You can reorder them by dragging the category in the menu structure.