Summary field

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Hi, I've generated a Php site that generates a simple report and makes the total of one of the fields. How can I add the total of one of the other fields?

 

Let me give an example

 

Employee 1 / Age  / Weight

Bert / 30 / 55

Geert / 24 / 78

 

Now i only get a total for the weight but I would to display the total for the age as well. With all the classes I gues it should be fairly simple but can't get my head around it. Any help would be appreciated.

[webko]

How does it do the total for the first field?

 

Should be simple enough to create a function that does the same for the second field...