Auto-complete values from other items???

[Leoram]

Greetings!

I'm in Tools, Attributes..., Properties..., Auto-complete values from other items.

The question is, when and how should I use this feature? What exactly does it do? I go to Help and the text that explains this option does not provide any details and doesn't have an example. Please excuse my ignorance if it is obvious for other users but I don't know what it is for. Will you please elaborate a little further on this? Thanks.

Leoram