How to refer parent node when we are at child element ?

Hi members, how everbody is fine.
i have one question.
i have four group in my template.
i am doing group total at the end of each group.
at the end of each group i want to check that if group A then
store group total in variable XX.
if that group total for group B thens store group total in variable YY.
then at the end of group B , after group B total
i want to subtract group B total from group A total.
any kinda help is greatly appreciated.
thanks/

hi,
below is my output.
Grouup 1
1st year 2nd year
------- 1 3
------- 10 11
all elements 5 5
------ 2 1
------- 4 3
Total 22 23
Group 2
1st year 2nd year
------- 5 6
------- 9 10
all elements 2 4
------ 1 0
------- 11 12
Total 28 32
total 28-22=6 32-23=9
so how can i subtract this above total from group 2 - group 1 ?
and this same like that if there is group 3 then
at the end of group 3 - right below of total of group 3
i need to display group 3 total - group 2 total ..
thanks.

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