When we buy an item from a vendor we mark the "customer" field in the bill with our customer's name. Doing so checks the box next to it saying "Billable." We didn't know what this meant, but it was automatic so we didn't think much of it. 3 years later and I have over $1,000,000 in "unbilled expense". 

I know I can turn this feature off now since we don't need it, but how do I get rid of all of these unbilled expenses? Apart from clicking through every old bill and unchecking the billable box I don't know how to fix this.

The closest thread I could find is here https://community.intuit.com/questions/776246-every-bill-is-not-a-billable-expense

In it someone suggests creating an invoice for all unbilled expenses and then deleting it. Would that be okay? Would it work when the expenses are all under several hundred different customer names?

Does anyone know of a way to remove these unbilled expenses? Thank you for reading!

I am running QuickBooks: Premier Mfg + Wholesale 2013