How Add Exception to any code

hi,
i want to add exception to this my code
in below code i want to add day name except group summary report

Code:

[#Line: DSP accline]
add: left field: at end : yeardisplayaA
local:field:yeardisplayaA:set as:$$DayOfWeek:$$perioddatefrom

[field:yeardisplayaA]
use : simple prompt
color : blue
style:normal bold
skip : yes

how to add exception of group summary report

Code:

##ifnotgroupsummary then $$DayOfWeek:$$perioddatefrom else no

this one is not working
thanks
hope some one will help