Could the stock price being entered manually if source is not available in the present program version?
Yes.
… (ganzer Satz) …
Yes. I do this to track stocks in a game, and since they’re fake stocks, obviously they don’t auto-update. There’s two ways I’ve found to do it. For both, create “empty” securities, named however you like.
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Enter your transactions (buy/sell), then right click the security, and Quotes->Create Historical Quotes From Transactions.
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Right click the security, Quotes->Create Manually. Then you’ll be able to pick the day and price.