Bringing Stock into a new Quicken account / Adjusting cost basis

unknown

I owned stock in a brokerage account that had been purchased in multiple batches (i.e.  different cost basis) and closed out that account. and moved all shares to a new brokerage.  When Quicken downloaded the existing account where I had them transferred downloaded  then entire batch as a single add.  In other words, the stock came into the new brokerage account (which already existed in Quicken) as a single add without the cost basis breakdown.  How do I update the different purchase dates / purchase prices in this new account?  If I create new transactions it will of course mess up my cash account.  I'm sure there is an easy answer to this but I can's figure it out.

NotACPA

My inclination would be:
1) Deactivate the OLD account(s) from download
2) TOOLS, Account List and change the account name to reflect the new brokerage and blank out the account number and related info
3) Exit Q, restart Q
4) TOOLS, Account List and click EDIT across from the account name.  Click Online Services and then activate the account with the new brokerage info.
5) Take a backup, just in case, and then delete the NEW brokerage account that your previously created.

Thus, the Old account becomes the account at the new brokerage and all of your history is intact.
When that new transaction (with all of the shares coming in at once) appears, just delete it.