Hierarchical Numbering

Hierarchical numbering bases all messages on a dependent message. For example, you could have messages numbered 1., 1.1, 1.2, 1.2.1, where message number 1 is an independent message. All other message numbers numbered 1.x and beyond are dependent on message 1. If you remove independent message 1 from the diagram, all dependent messages will be removed.

To display hierarchical numbering:

1 Click Tools > Options.

2 Click the Diagram tab.

3 Select the Sequence Numbering check box.

4 Select the Hierarchical Messages check box.