Erase Memo/Notes field for all transactions in an account (Q Mac)

I recently transferred investment transactions from one account to a new account. Quicken incorrectly populated the memo/notes field with "Transfer shares from IRA - lot X of 199 where X is a number but based on the date of the transaction the X is the wrong #. Since it's wrong, I'd rather remove the text in all transactions. Is there a way to do this without doing it manually for each transaction?

I know I can hide the field but I don't want to do that because new downloaded transactions will have valid comments.