When you're setting up, you'll come across a section where you have to enter your company information.
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Towards the bottom of the page, you'll see that you must assign a category. Within the drop down there are over 4000 different categories you can select from.

However, if you can't find a category that is specific to your business, then we advise that you choose one that is more general.
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For example, there isn't an option for a "water heater installer". But they do have "plumber" who covers this service.
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So, go more broad until you find something that is suitable.
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The category is used to help drive the recommendations the platform makes around your keyword strategy and local SEO actions. So please take your time to find a category that suits your whole business.