How To Add POS Income Categories
To add a category of income for "Drinks" for example:
Go to settings>general settings/school settings
Then click on "Financial and POS Settings" and then enter "Drinks" or whatever you want it to show up as in the "POS Income Categories" field. It is important to add a comma,then the title with no space. For example, Misc.,Basic Down,Merchandise,Tuition,Event,Belt,Seminar,Private Lesson
DO NOT leave a space after each category you type, it on drop down in POS it will show as a blank. Attached is a screen shot, and I notice you have a blank after the comma before "Belt". So you need to remove this space for Belt to show up as well.
See the video if you would learn better that way.