You can create additional tabs in Catalog Settings > Catalog Design > Single Page Design:
With Add Tab and Remove Tab buttons you can add unlimited number of custom product page tabs.
Each tab can have a different name. The tab name becomes tab label on the product page:
It will also become the label for the custom content box on the product edit screen.
Each custom tab has a separate box on the product edit screen:
You can add any content there, the same as in the description.