Multiple time series in 2000i

["Gray, Gabriel" <Gabriel.Gray@xxxxxxxxxxxxxxxxx>]

Anybody know how to properly combine multiple time frames in TS 2000i.
The system iterates on the first data stream, but if I want to say take
an average of a second time frame, do I have to save those values in an
array to reference them or can I just use the brackets and add data(2)? 

Thanks in advance
Gabriel