MyPersonalSubmitter allows you to enter your words and select an higer level category. If no matching categories with your own words exists, Mypersonalsubmitter tries to find category with an higher level (selected as main category). If several categories match with your user words, Mypersonal submitter chooses a category which is a subcategory of your main category.
Take us an example. You submit a site about books for children. Books category may appear several times as asubcategory of Arts, Shopping, Children,...but "Books for children" does not exist. In this case, Mypersonalsubmitter will choose "Books"as subcategory of Children.