Hello @carole9,
Reclassifying your transactions can only change the accounts, classes, or locations affected. You'll want to manually change the creditors of your affected transactions. You can then make inactive the chart of account that has got no transactions in once you have made the changes.
The alternative and best option If you have 2 creditors EURO and you only need one you can look at merging the 2 in the chart of accounts section by going to the edit on the drop down menu by that chart of account and naming it exactly the same as the other one.
Here's a couple of articles you can read to learn more about reclassifying your transactions and how it works:
I've also included our help articles in case you need some ideas, especially with QuickBooks navigation and daily tasks: QBO Self-help.
If you have any other questions, feel free to comment below. Always here to help you.
