On this tab of the properties dialog box, you can select the bolt behavior at collision check and numbering.
Used for numbering
The bolt is used for numbering.
Used for collision check
The bolt is used for the collision check.
Used for lists
The bolt is used in the bill of material.
Explicit quantity
Defines the amount in the bill of material. Thereby it is possible to create one part in the model an multiple parts in the BOM.