Controlling propogation upwards to bb.html and bb2.html 🔗 link

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.