Comparing or combining values in a column - spss

Question

Scenario and question:
Basically I have results for a matched pair survey of couples in SPSS. It's set up where the person A's answers to questions 1-10 are the first 10 variables and then person B's answers to questions 1-10 are the next 10 variables. But I need to run tests and produce crosstabs for individuals, so if I have 20 couples the crosstabs outputs should be out of 40. I was able to simply select all the data for the "person B"s in couples and just copy and paste it over, however I lost couple-specific data and I still need to be able to create new variables based on the matched pair information. My way around this was creating a new variable while still in matched pair form called CoupleNum, so even when they were in individual form I could say if their couple number equaled each other calculate this or that. But I don't actually know how to do this. In the same dataset, how do I compare rows for the same variable?
Example for what I'm talking about:
Here's fake data
A_CoupleNum
A1_HappyScale
B_CoupleNum
B1_HappyScale
1
6
1
4
2
2
2
3
3
9
3
7
I'd move it to individual form like
CoupleNum
HappyScale
1
6
2
2
3
9
1
4
2
3
3
7
And then I'd want to be able to make a new variable called CoupleHappiness that was the HappyScale for each person in the couple added together.
CoupleNum
HappyScale
CoupleHappiness
1
6
10
2
2
5
3
9
16
1
4
10
2
3
5
3
7
16
So essentially I'd want to code something like
if CoupleNum = CoupleNum CoupleHappiness = HappyScale + HappyScale
I know this is definitely not correct but hopefully it gets my point across and what I'd like to do.
Potential solutions I've found that don't work/I don't know how to make them work for my needs:
Since I'm new to SPSS, I've found several things that might work but I don't know SPSS syntax well enough to suit them for my needs. I've noticed people mention things like LAG functions or CREATE + LEAD if they were in adjacent rows, but they could be all over the place. Someone also mentioned using case numbers but I don't exactly understand that.
Sorry this was a really long question but I would appreciate any help!!

Answer 1

What you are looking for is the aggregate function. In this case you can use it this way:
NOTE - this code was edited and corrected:
aggregate out=* mode=addvariables /break CoupleNum/CoupleHappiness=sum(HappyScale).
The function groups all the rows by values of CoupleNum, then for each group the function will calculate the sum of HappyScale and put it in a new variable called CoupleHappiness.