Compound Work zone key in Oracle Field Service

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I am trying to use both City and Zip code as work zone key (Work Zone Key: ZIP/Postal Code(6, case insensitive) + City(4, case insensitive). How should I add a new work zone? What should be its work zone keys.

For e.g. I need an activity to have Work zone A, only if the zip code is 123456 and City as ABCD. Is this how compound work zone keys are meant to be used? How should I add a work zone in this case

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