I had to create a new estimate and invoice because I didnt know how to correct the existing ones in quickbooks.There was already a payment applied & now have to payments?

Hello Mon13,

It's great to have you join the QuickBooks Community. Rest assured, I'll be happy to point you in the right direction so you can continue to record your transactions with confidence. 

Based on the info you've shared above, I  recommend consulting an accounting specialist for expert suggestions. This ensures your books remain accurate while you continue to manage your work with peace of mind. You can also get in touch with a professional using this link here. Otherwise, in case you decide to delete certain transactions in QuickBooks, I encourage you to check out this article here for more info. In case you need to refund the customer, here's a helpful article that shows you how. 

Let me know if this info helps. I'm here to steer you in the right direction.