To add an item to your project, go to the Builder and click "+Add Items".
This will open a search box where you can search for the product you'd like to add.
Note that when you search, your "favorite" items will show up in bold. This includes items that you have used before, or items that are in your Custom Products Database. Any bundles that match the search criteria will show up in blue at the top.
Select the item you would like to add.
If there are no matching products in the database, you can create a new item.
Enter/update the item data as needed (item price, cost, shipping, labor hours, etc.)
Be sure to click either Add and Next or Add and Close when you are done to save your changes.