How can I clean up an investment account that has been compromised by old downloads.
I have 3 investment accounts, a bank account and various asset accounts in one primary account. The trouble started last fall when Vanguard assigned new numbers and changed the formats of their mutual fund style accounts to brokerage accounts, affecting my 3 investment accounts. I had one issue which I finally resolved (no thanks to either Quicken or Vanguard) and then sometime between March 1 and April 1 of this year, either Quicken made some changes in an update or Vanguard changed their download parameters and all of a sudden multiple transactions from past accounts associated with one particular account flooded in. (Old accounts which I had removed from downloads suddenly were added to this one account). I've used Quicken since 1990 and been with several brokers before Vanguard and funds have been sold, transferred, stocks added and no longer used, etc. And, I regularly transfer $$$ from this account to my bank account so just deleting transactions is not possible.
I can see the issue, I'm just not sure how to correct it without upsetting the balances in the other accounts. It occurred to me that as a last resort I could just add a new account, with the same number as the old account for download purposes and "retire" the existing account. Of course that would lose all the historical information in that one account (but it would still be accessible in the "retired" account if necessary) which would be nice to retain for at least two years.
I don't rely on Quicken for my profit/loss information but use Vanguard's web site for the most reliable information and use that for tax purposes.