Doreen, I've created a free-space page and linked it to the category, as described by Natalie. As you can see it's included in the Category Info Box. https://www.wikitree.com/wiki/Category:Herald%2C_Arrived_9_Feb_1845
I've orphaned the free-space page so anyone is free to add more information and sources without affecting the content on the category page, and to adopt the page.
Please feel free to message me if you want any help with any Australian categories.