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To do this you will need to create a cartesian relationship and run your calc through that so that the calc has access to all records.
...and how can I do that? Please explain a little bit on the 'cartesian relationship'
A cartesian join uses the X operator when you set up the relationship. This type of join ignores the field contents of the match fields and simply matches all records in one table with all records in the other. If you use this in a self join relationship, you get a whole of table match. You can then achieve a total of all records in the table by pointing your calculation through that relationship.
If you use a calc like fieldA + fieldB you will get only the total of those two fields on the current record added together.
However if you use Sum ( wholeFile::fieldA ) + Sum ( wholeFile::fieldB ) you will get the total of those two fields in all records, which I think is what you are after.