Creating a New Category
On your uServe Merchant Page, click on the "Items & Services" tab and then the "Categories" tab.
You should be prompted with the Categories Library where you may click on the blue "Add new" button on the top right corner. You can then create your category, filling in the name, description, and selecting whether you'd like an item-specific tax to be applied (created in the "Tax" section).
Your new category will now appear in your Category Library and can be assigned when creating a new item.