I have tried watching tutorials, but I do not have the add tool option or even duplicate (one you tube video I watched said to duplicate). Is there a new updated tutorial?
You first need to create a user library, using the “New Library” icon:
Tools is CC’s default database are organized by material, you may or may not want to do the same (I’m lazy and add all my custom tools in a single library)
You should then be able to right click on a category, to create a new tool: