Hi there usergustavo-perez,
It's vital that all transactions are correctly entered so that your sales totals can be correct.. QuickBooks Online is a great tool that allows you to create projects in order to keep track of profitability on various jobs done for customers. I can provide some information about projects.
Projects are meant to represent a job or project done for a client, so it must be associated to a customer. There isn't any way to keep track of a project without associating it to a customer. You may benefit from using classes to keep track of those expenses instead, as they don't need to be associated to a customer. You can view some information about classes in QuickBooks Online in this article.
If you have any other questions, feel free to reach out here.
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