Android application(.apk files) updating for an existing app in Google play

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http://stackoverflow.com – At present I am having four .apk files for an android application with different version code and version 1.0 . Now I want to update my app with same four .apk files but there are now some changes in the manifest file for each apk. I a using same certificate key(existing one) and different version code with 1.1 version for each updated .apk file. Now in my Google play account for that app, existing four apk are there in active mode. Now when I will upload my updated four apks, I have to activate them too. But my question is that should I deactivate the older ones or leave them as it is ???? (HowTos)