Creating a subitem by modifying the item title

Select the item.

the selected item is shown

Edit the title by pressing F2 or using the menu

text box showing the item title

Edit the text, using ' \ ' (note the spaces around the slash) to separate the item's and the subitem's titles

text box showing the edited item title

Press Enter or click Ok to realize

the new item appears under the earlier item

The text on the right hand size is copied from the original item. You have to change it yourself because the application won't know how (or even if) to split it up.

the subitem's text is changed

Going back to the original item we see that it still has the same text:

the item's text is still the same

Note that it's possible to create several sublevels at once by using multiple backslashes. Mind that the text is repeated on all levels.

To be honest: I nicked this idea from Lotus Notes