TTSum() takes an arbitrary list of result IDs and returns the sum of the times in those IDs
TTSum(10;20;30;40) - equivalent to nz(T10)+nz(T20)+nz(T30)+nz(T40)
TTSum() takes an arbitrary list of result IDs and returns the sum of the times in those IDs
TTSum(10;20;30;40) - equivalent to nz(T10)+nz(T20)+nz(T30)+nz(T40)