Selling services will involve a large number of settings in SD, MM and PM. It's too large to sum it up in a single reply. Usually questions here should be more specific.
Still, since you are selling you will require maintaining customers, pricing, sales documents, billing documents, service orders in case the kind of service is complex.
Plant maintenance if for maintaining an enterprise's own assets. Customer service is an extension of the PM module and it is for maintaining the customers' assets.
Bala
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