Actually, you can define these measures in the Information Map.
Using the expression editor, you will need to include code that works in SQL.
For the example total subscribers = new + existing - canceled, you will need to do something like the following:
CASE WHEN subscriber = new THEN 1
ELSE WHEN subscriber = existing THEN 1
ELSE WHEN subscriber = canceled THEN -1
END
Then on the data item properities 'Classifications, Aggregations, Formats' tab - verify that this is defined as a measure with the only aggregate function as SUM.
~ Angela
http://sas-bi.blogspot.com
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