Balloon refer to top level item in indented BOM instead of part?

I'm using an indented BOM with detailed numbering. When I'm putting balloons on the diagram, I would like to have the balloon number refer to the top level sub-assembly instead of the part itself. (ie. 1 instead of 1.1.4)

Anyone know if there is a way to do this that I'm just missing?

Thanks!

SolidworksBill Of Materials