With BlinkBid Online you can easily sort your line items and categories. First off you need to know that Fees category is always locked at the top which is a standard industry expectation. As fare as the rest, you have total freedom.
To sort line items within category. Simply click, hold for a sec, and drag.
To sort the categories, choose the Sort Categories item from the hamburger menu. Then drag and drop as you need using the handles at the left of the category.