If you look at the sample data in microsoft's help file example, they have one "division" in their Gantt chart series (column C days left for completion). In order to get additional "stacks" for additional divisions of a task, simply add columns.
task -- starting date -- days to complete part 1 -- days to complete part 2 -- days to complete part 3 --...
task 1 -- 0 -- 2 -- 2 -- 1 --...
task 2 -- 2 -- 3 -- 1 -- 4 --...
and so on
Be sure to include the additional columns in your stacked bar "Gantt" chart source data.
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