You can find it here [1] on Jean-Yves' very interesting site.
A value breakdown structure is, along with critical path drag [2], drag cost [3], true cost, and some other metrics, a feature of the Total Project Control methodlogy. For those who are not familiar with the features and benefits of a VBS, I think this article explains the concept quite thoroughly.
Fraternally in project management,
Steve the Bajan