relation of expense to a service

[Caffeinate T. W. <moc...@ya...>]

We sell ad space on our web site. I think it would be considered a
service in inventor and not a part. So I needed to add a service:

1. Inventory / Add Service
2. Number: BRS120120 
   ...
Then I get to Links Accounts:

Income: 4050-Sales/Banner Ads
Expense: *** THIS IS WHERE I DON'T GET IT ***

How does expense relate to the service being sold?

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