Changing the legenda of a graph

Dear excel(lent) users,

I have created a graph in which I show the status of interfaces in
percentages. All the names of the interfaces are on the x-axis. Some of the
names are belonging to a special group. How can I make those names stand out
on the x-axis. I tried to change the axis, but the changes will be for all
the values, not the selected group.

How can I arrange this ??

Thanks for helping !

--
** Fool on the hill **

if your data is

A 6
B 4
C 9

and B is special, create a new column

A
SPECIAL B
C

and use that for the x axis labels