Hi,
We do not have any recipes or formulas to use cake mix as a flour. Cake mix not only has leavening but it also has sugar, so it would not be a good substitute for flour. I would suggest that you for recipe that use cake mix and add other ingredients to make it special Here is one to try.
http://www.bettycrocker.com/recipes/tall-dark-and-stout-chocolate-layer-cake/66ef875f-6973-4903-a1c2-943a4e13d51e