In every FogBugz case, you can easily cross-reference another case by entering any variant of the text
Case XXXX (e.g. Case 1234) in a case edit. FogBugz will create a link to that case in your edit, and also provide a list of cross-referenced cases in the left menu bar under the heading “See also”. If you hover over either of these links, FogBugz will even show you a pop-up summary of the case!
To link to Wiki pages, enter W followed by the Wiki number (e.g., W1234) in a case edit. FogBugz will create a link to the wiki in that edit, and add the title of the wiki to the “See Also” section next to any linked cases.