In the following example, the screw will be defined as a group.
Activate the view which contains the entities you wish to pick.
Click the Create
Group icon in the main menu. The Create
Group Feature Tree is displayed:
Required Step 1 
Pick the screw edges using the box selection and Exit:
Required Step 2 
Enter a name for the group and pick reference points. By default the first point picked (dark red) serves as the origin reference point:
Optional Step 3
Pick any of the newly-defined reference points to define a new origin point and Exit:
When you are finished, press OK
or Apply 
in the Feature
Guide to complete the function. A master group is created. To apply
an instance of this master group see Place Group.