Do the following:
Site actions -> Site Settings -> Site Columns
From there click "Create"
You can now decide what type of column to create. In this case, click "Lookup (information already on this site". Further down, under the option "Get Information From" select the list you wish to pull the info. From there you can select the main piece of information and the subsequent related information you wish to display.
Once you create this column, go to the list in which you want to insert the column, click "List Setting" then "Add existing column". I save my custom columns in the group "Custom Columns". Click the newly created column, and insert it into your list. It will populate with the different pieces of information you're pulling.
Hope this helps.