There are some ways
OR if you want to use a feature that almost nobody even knows about let alone utilize, you can always use the built-in 'load config partial' command that will essentially merge two configuration files for you. I personally don't like it as much because I've seen a lot of people use it for something it's not designed to do....but this...this is exactly what it's meant to do ;-)
Essentially you follow the following format and you can 'merge' (or 'replace' or 'add') the address-group section from one config file to the next, right on the box.
load config partial from <filename> from-xpath <source-xpath> to-xpath <destination-xpath> mode merge
I personally actually really like @vsys_remo option number 1. BUT depending on how many address-groups we're talking about (and if you have to move over the address objects as well) this may be a better/faster solution for you.
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