as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
moving from google finance to yahoo finance
user
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.
assistant