Through the help of this mailing list I was able to resize the font
for different levels of an item group using the inner command;
however, this has had some unexpected effects on the size of my
bullets.  The first bullet in a list is sized based on the preceding
font size, while all of the other bullets are sized based on the
specified font size for that item group.  That probably wasn't clear,
but I'm hoping this example will explain what I mean.  I attached a
file of my output from this example.



\definesymbol[1][\hbox{$\bullet$}]
\definesymbol[2][\hbox{$\circ$}]
\defineitemgroup[bullet][levels=2]
\setupitemgroup[bullet][1][1][joinedup,inbetween={\blank[3*small]},inner={\switchtobodyfont[20pt]}]
\setupitemgroup[bullet][2][2][joinedup,inbetween={\blank[3*small]},inner={\switchtobodyfont[15pt]}]

\starttext
\startbullet
        \item Test
        \item Test
                \startbullet
                        \item Test
                        \item Test
                \stopbullet
\stopbullet
\stoptext




Mike