Also consider using <<Visibility rather than <<Delete.
Report(biv)[Outline Box(3)] << Visibility("collapse");
"Collapse" will hide the box and remove the space it uses in the report, without deleting the box. Two advantages: (1) the displaybox numbering does not shift around and (2) some platforms might be confused by deleting certain display boxes they depend on.
I like Jim's final example combined with Visibility:
dt = Open( "$SAMPLE_DATA/Semiconductor Capability.jmp" );
biv = Bivariate(
Y( :NPN1 ),
X( :PNP1 ),
Fit Where( :SITE == 1, Fit Line( {Line Color( {213, 72, 87} )} ) ));
Report(biv)["Summary of Fit"] << Visibility("collapse");
Report(biv)["Analysis of Variance"] << Visibility("collapse");
Report(biv)["Parameter Estimates"] << Visibility("collapse");
which explains itself to anyone that needs to understand or maintain it later.
Craige