Hi Rosalita.. Schwab does this automatically for re-invested dividends, but not for dividends paid out! I have stocks set up both ways, so while it is tempting to ponder the numbers they display, they are essentially worthless for comparison. I have also not bothered to input all my past history into their site for some of the stocks I had before putting everything into Schwab.
Instead I use Quicken. I look at the IRR figures for overall yield. There are some buggy aspects when dealing with mergers and stock splits so I would not trust Quicken's numbers 100% for tax reporting of gains (see Quicken forums for discussions of this) but it gives a good general idea. I can download from Schwab to Quicken so keeping track is easy. You will have to expend some effort in entering the history but I got over (most) of that a few years back.
Other people use MSMoney, which I believe is similar. I am stuck with Quicken for Mac (ONLY bad thing about owning a Mac*  , though the product was free with my computer). Neither software seems perfect but until something better comes along they are OK. It takes some w*rk to set up, less to maintain, but is the only way you will really be able to track your individual stocks, unless you want to set up your own Excel worksheets, which some people here do. Not a bad idea if you don't want to shell out for Quicken/Money and don't need/want their checkbook mgmt. aspect.
Check to see if your current brokerage allows for downloads to MSMoney or Quicken (if a Mac user beware as many institutions support the PC version but not the Mac, since Intuit apparently makes them pay for the privilege of offering the service). If they don't then you lose the benefit of not having to enter your future transactions and you might as well go with a spreadsheet.
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