Hello, summerimex.
Thank you for turning to the Community for support. I'm here to provide some info regarding editing categories in your QuickBooks Desktop account.
For the option to add and edit items in one category and in a specific order, I recommend submitting feedback to the Product Development Team. Once you've done so, keep an eye out on the Firm of the Future site for info about product updates and feature releases. Many improvements to QuickBooks platforms come directly from great user suggestions like yours.
Feel free to stick around to find out what other QuickBooks users have done in similar situations. I'll be here to help if you have any other questions.