Create Portfolio category
Step 1 - Log in to your WordPress Administration Panel (Dashboard). Step 2 - Click the ' Portfolios' tab. Step 3 - Click the 'Categories' sub-tab.
Step 4 - Start filling in name of portfolio categories that the name is how it appears on your site. Step 5 - Filling Slug :The “slug” is the URL-friendly version of the name. It is usually all lowercase and contains only letters, numbers, and hyphens. Step 6 - Parent: select parent for portfolio.
Step 7 - Description: fill in about this portfolio categories.
Finally: Click button "Add new category" to create categories.
Here all portfolio categories has created.