Sift the cake mix so everything is mixed evenly. Weight it and separate exactly half of it. Use half and keep the other half in an airtight plastic bag in the original box so you will know what mix is it and when is the expiration date. With the busy life style that most of us have these days it is easy to forget what is in the bag! Believe me I know what I am talking about.....
The new 'cupcake mixes' at walmart are 1/2 cake mixes. That's why I picked some up. Otherwise make the full mix and freeze your left overs.
how about oil ,eggs and water just half it too. If it calls for 3eggs use 1or 2. I am sorry to be a pain . Thanks again
for the water or oil it depends how much its asking for but if your cake mix is saying to use 1 & 1/3 cups of water; half of that would be 2/3 cups of water. 1/2 cup of oil; half of that would be 1/4 cup oil. 3 eggs half of that would be 2 eggs. Your not a pain, you just asked for help and I Hope This Helps You! 
Yes, basically halve everything. I just beat a large egg a little with a fork and use half of it! or maybe you can use 2 small eggs instead of 1 1/2 large eggs because 3 large eggs(~150 g) weight as much as 4 small eggs(~152 g)!!!!!
I went a head and just half everything use to med. eggs and mixed it with the other mix and it baked up fine. Happy Birthday cakesdelight .
Thank You for the Birthday Wishes Sammie! 
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