Each of the sections or tabs in a TI process can be referred to as a script and have a unique purpose. For example, the metadata section (or script) can be used to create and maintain TM1 dimension objects. The metadata script can also be utilized to create and maintain subsets.
TI processes can also have no data source defined. In this case, only the prolog and the epilog sections are available to you.
It is also important to fully understand that the code in the metadata and data sections will execute for each record or row in the defined data source.
The Data section (or script) is the section that is used to perform
CellPut operations to actually load data from the data source into a cube.