QWin 2017: How can I transfer activity from one investment account to another.

unknown

I just started using Quicken Premiere (2017 for Windows).  I've spent the last few days trying to transfer all of my old data over to Quicken.  I have about 15 years worth of data which started from Microsoft Money, iBank, and YNAB.  I finally decided that Quicken is probably best capable of handling what I want as YNAB has been chugging with so many years of transactions.

When setting up Quicken I created new accounts for all of my bank, credit card, and investment accounts.  After that was all set up I started working on importing my old data.  I thought I was being smart and imported it into new accounts figuring I would transfer the data into the true accounts after I rectified all of the transactions and balances.  I figured this was a safer route.

The problem I'm having now is that I can't move all of the investment transactions into the existing accounts.  I thought I would be able to just select them all and move them like I can with banking accounts but that doesn't seem to work.  I know I can transfer the shares but then I lose all the register data.  

Anybody have any ideas what I can do to fix this situation and get all of the transactions from one investment account to another?  Thanks.

unknown

I was reading a few other threads and it mentioned exporting the account to a QIF and then importing it.  I think that would probably work.  My hesitation with deleting and re-importing the old QIF from iBank was that I already put in a ton of work into cleaning up the transactions.  I think if I export it from Quicken though all that work should be saved.

Could I export a Vanguard-IB account (stands for iBank) and then re-import it back to my plain Vanguard account?  Thanks.