It appears that you have two "pseudo" subcategories under Simulation - Simulation / Sim and Simulation / Testing. I highly recommend creating an actual sub-category for these (used by creating a task category and assigning its parent category to "Simulation"). I suggest this because:
- It will help keep individual task titles shorter.
- The "Name:Other name" naming convention is generally reserved for Namespaces in MediaWiki.
It's not going to cause any issues either way, just a friendly suggestion. Pages are renamed by "moving" them in Mediawiki. To access this as an option, you will need to enable "Show Advanced Features" under the Appearance tab of your Special:Preferences page. After that, there will be a dropdown menu to the right of the Edit button on all pages with features like that. If you have any issues, let me know.