Controlling propogation upwards to bb.html and bb2.html

I have the main bb page, then a page, then a subpage. Is there any way to specify that the entire subpage not propogate upwards? It would be fine (actually, more desireable) if the subpage propogated upwards to the page, but not all the way up to bb.html or bb2.html. After reading the Hobbit manpages, it appears that the only way to control propogation is at the individual test level, but I am not certain about that.