...or "- " vs. "->"
If you are a frequent user of Oracle BI Answers, you might find the following rather useful

As you know, presentation tables can be nested or indented to ease navigation. I know you're smiling now and think "why is he bothering me with this kindergarden stuff?".
Of course you know how this is achieved. Let's visit the Administration Tool: Notice two things here:
First, the stop sign icon, which indicates a Presentation Catalog in the Oracle BI Applications rpd file which you should no longer be using.
Second, the well-known use of the hyphen and space "- " combination in order to achieve the indentation of presentation tables.
Let's label this "Analytics Style" because this is the way it has been done.
Now let's have a look at the new presentation catalog:
When you open the Properties dialog for an indented presentation table you see how it's done:
Simply type "->" in the Description and the BI Presentation Server will interpret this as the command to render an indented presentation table. The description will render into a tool tip and yes, it does include the "->".
Let's call this "OBI EE Style" and use it from now on.
Happy indenting
