As long as your external hard drive isn't NTFS formatted, you should be able to. When you install CXgames, your .cxgames directory (wherein lie the bottles) is created. Copy that directory to your external drive, and symlink from your home directory's /.cxoffice to the primary location on the external, so that all /.cxoffice activity is actually taking place externally.
If you're using Crossover Linux, you won't be able to load or use bottles created in Crossover Mac
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