This is possible. Inside the help editor for a function panel or control, you can specify a help file name and a context ID. When the user chooses help, CVI launches the help file and does a context lookup for the ID you specify. The help file must be in the same directory as the .fp file. Following is an example of the text you would put into a help editor window to have CVI open the file "MyHelp.hlp" to context ID 2001.
:$@SYSHELP2001:
David Rohacek
National Instruments