Unique allows you to automatically exclude them from other sketch groups. This way you can rectangle select and these elements will be omitted from another group.
Hi GaneshKadole and Sebastian5050
Thank you for your best support .
I tried to do it already, but i can't see the different of it, I'm not sure about my step it's correct?
my step is :
1. Select curves and add to the Unique of new sketch group.
2. Choose Menu→Format→Group→New Sketch Group and click Normal of Group content and trie to select all curve, So!!!! all curve is selected (include curve in Unique group).
*** see picture in attached
An item in one group will not be added to a new unique group. Normal groups take whatever you select and don't care about membership in other groups.