[HELP] Upgrading Android version of a ROM - Android Q&A, Help & Troubleshooting

I'm very new to android development, so pardon any noob like things.
I want to update the version of android of some custom rom, could I do that by cloning aosp of that newer version and then merging the custom rom(old version) with the newer aosp.
If this is not possible is there any method that can be used to upgrade the android version

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