Sub-Analysis Capabilties

Hi,

Is it possible to have a sub analysis with a different dimension than the main analysis? An obvious use case would be the main analysis shows sales by product line and the sub analysis can show sales by product based on the selected product line in the main analysis (focused analysis). At this point besides a graphical representation of the main analysis, I fail to see other use cases of the sub-analysis if one can't use different dimensions or drill-down states

Thanks.