Unfortunately the portfolio in my themes are not overly robust, but function like the blog category and post method. To do it as you are wanting is not quite as easy because it’s done by date. Options are:
1. find a plugin that will organize items (they exist actually)
2. Code the category.php file with a custom order query
3. list out on paper your items and then add them in the order you need them alphabetically (using the date ordering)
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