When you add a new set of tasks, the Gantt Chart Maker use the previous task number and increment it:

If the previous task number is not numerical, then the new series is numbered with 1:

To update the numbering (e.g: after a while the tasks are not numbered correctly, you would like to use your own numbering system), you can follow the below step:

1. Start with allocating a task number or reference for each task (the head of each task set)
2. Use the function « Modify -> Update the numbering » from the right click menu or from the ribbon menu

From the ribbon menu:

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