Sorting drill-down master dimension by measure

[Newbie777]

Hi,

I'd like to sort out the drilled down master dimension also by measure.  The 1st dimension before the drill down can be sorted by measure, but I cannot find an interface where I can sort the 2nd drilled down dimension also by the same measure.  Specifically, I'd like to sort our the higher level customer hierarchy by Sales amount and then also the drilled down lower level hierarchy customer dimension also by the sales measure, but I don't know how to.  I'd appreciate it if you could let me know how I can do that. 

Thanks a lot for your help.