I'm sorry I wasn't specific, I am talking about putting in a sales invoice. We offer plumbing services..so when I put a new item in, I don't have to link it to an expense account?

I'm sorry I wasn't specific, I am talking about putting in a sales invoice. We offer plumbing services..so when I put a new item in, I don't have to link it to an expense account?

That's correct. If you used the item in a Purchase invoice, then you might want to have an Expense account linked so there is always some consistency in how you do the data entry and which account gets the expense.

But if you are only using the items in Sales, then you do not need a linked Expense account.

If you subcontracted work to an external service tech/plumber for a larger job where you needed more people, then maybe using a service item with a linked expense account to record the expenses he or she will bill you, might be something you wish to do.