How to move transactions from one Vanguard account to another new one?

rayrol Member ✭✭
edited January 15 in Investing (Mac)
I already had an existing Vanguard account number with many years of transactions that I was downloading every day any new transactions and now have had to get a new account number and when I try to link the old to the new account, it loses all of the old transaction details including cost basis for each but the total shares is ok. I was hoping to be able to change the account number from the old number to the new number and not lose anything. Use to work when I was on Windows about 7years ago but does not work on Mac when I tried today. Any help would be greatly appreciated, as I do not want to have to manually enter well over 5000 transactions. Thanks
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