Material items and sub-items are organized by category such as anchor, guy, or transformer. You can add and remove categories, items, and sub-items as needed.
Materials panel
Material Catalog.
Click the new category and provide a name. To remove a category, click the category and then click Remove Category.
To remove an item, click the item and then click Remove Item.
Click either Add From Catalog Item or click Create New Catalog Item. Create New Catalog Item creates a new item in the sub-item table as well as in the item table in the current category. If you click Add From Catalog Item, the sub-items table becomes editable. Navigate the Category list to locate sub-items to add to the item. For example, open the Part category and click Bracket. Drag and drop items to the sub-item table or press CTRL + A to add the selected item to the sub-item table. Click Submit Changes. The sub-items are saved with the item.
To remove a sub-item, click the sub-item and click Remove Sub-Item.