Creating a balloon callout with two leaders

[wapperdude]

You're nearly there.

Easy way: 
1.)  Set your Visio display to "tile" windows.  For V2007 that would be Window>Tile.  This is mostly for convenience.
2.)  Open Drawing Explorer Window and navigate down the Foreground Pages>Page-1>Shapes>Custom callout>shapes.
3.)  Sheet.3 is existing line.  Open shapesheet for reference. Right click in shapesheet window and select Formulas.
4.)  Sheet.4 is your new line.  Open shapesheet for editing.
5.)  Make Sheet.4 1-DEndpoints section look same as Sheet.3.  Copy /paste works.  But, in Sheet.4 change Controls.Row_1 to Controls.Row_2
6.)  Optional:  Sheet.4, Geometry1 section change entry for Geometry1.NoShow to match entry from Sheet.3.  This will turn both lines on/off.  Otherwise, new line is always on...maybe what you want.

That should do it.

HTH
Wapperdude

[Sven]

Thanks, that worked!  I appreciate you sticking around with me.  It took a while but I got what I was looking for.

[wapperdude]

That's great.  Glad it's working.  Have fun.

[Sven]

Here's the final version in case anybody would like to use it.