It changes your view into non-associative, non-parametric line segments. You can then group them together. Once you snapshot a view, there is no reversal.
I've used it in a case where I created a outline drawing of machine.
By taking a snapshots, we don't have to fetch whole machine to work on the drawing and we need to add 'created dimensions' which does not have to go into assembly model.
Also we sketched in some phantom lines for opening of doors and dimensioned it.