I see how to add a new column, but in my files I have a "Remix" column. I dont see where this is available under adding a column. Any help is appreciated.
You can add every column you want.
To get the exact name for your specific "Remix" column, you have to press ALT + T on one of your tracks including this value. Then you can see what name exactly you have to use as placeholder for the column-value.