There are several custom indicators that come with MetaStock Professional for this broad market information. The all start with BM, such as "BM NASDAQ Advance/Decline Line". At the top of MetaStock Professional you should have an Indicator Quicklist with a drop-down arrow you can click on to see a list of indicators.
You will need to use "The DownLoader" to update these formulas, however. In The DownLoader, click Tools-->Download Prices. Add the folder C:\MetaStock Data\BM Data from the left-hand side to the right-hand side. Click Ok
Make sure you wait until after market hours to update this folder, or set the "Ending Date" field to yesterday's date.