OS Update package creation

I am having some issues building a package for Windows CE 7 Operating System Deployment. I have the OS Update files from Zebra, but I am not able to create a package to deploy them to the devices that already have Avalanche installed.  The only way I can do it right now is by installing manually? IS there a method of creating a package using the OS update files I already have. I was initialy trained on Avalanche over a year ago and we just started deployment this year so I am not up to speed on how to do package creation;