The Level Based Metrics are the classification of the specific measure according to a dimension. If we have number of products as one of the measures and timeline as one of the dimensions we can have number of products per year or per month gotten out as a LBM. We can do this by creating a logic column for the specific measure and then dragging it onto the specific dimension say month or a year. The LBM can be pertaining to specific dimension or intersecting dimensions. You can get comparative data against different levels of the dimension.