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Moving from Google Finance to Yahoo Finance
Perhaps you should use your own tracking software, such as GnuCash, Quicken, Mint, or even Excel.  The latter would work given you say you're manually putting in your transactions.   There's lots of pre-done spreadsheets for tracking investments if you look around.    I'm hoping that a web search gets you help on migrating transaction data, but I've yet to run into any tools to do the export and import beyond a manual effort.  Then again, I haven't checked for this lately. Not sure about your other questions, but I'd recommend you edit the question to only contain what you're asking about in the subject.