Q: "I have an account that I need to pay off, but I don't want it to be recorded in (let's say today's) sales, since we already have it recorded when the service was completed. What happens or how it would affect the sales/credit card sales/batch/balance sheet?"
A: When you tender an order to a house account, it is counted as a regular sale. More specifically, a non-cash tender. This will show on your balance sheet each day as being paid. When you apply a payment to the balance due on a house account, that is considered non-sales revenue and will not count as a sale on the balance sheet on the day it was applied since it is not taken as an actual payment that day; you’re only paying back what you’ve already spent.