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Changing the company name on invoices already created is very simple and there are two ways to do so.
One is by creating a new template for that invoice. Then change the template by clicking Customize, which will be at the bottom of your window in a grey menu bar.
The other option would be to individually go through every invoice and changing the information that the customer sees.
This method will allow you to manually change the information for each invoice. If you have any questions, please feel free to reach back to me.