I copied and pasted this from the BC24 help files. Hope it helps.
The Thread feature allows the user to create a thread milling procedure. When a Thread feature is added to the CAM tree, the system will also add the following items:
Start Point - This item in the CAM tree allows the user to specify a location for the tool movement to start.
Thread - Right click on this item in the CAM tree to produce a pop-up menu with three options for the user to choose from:
Edit - Allows the user to modify the settings that are used when calculating the tool movements. See The Thread Mill Wizard for detailed explanation of this dialog and all of the options available for this feature type.
Compute Toolpath - When this option is selected from the pop-up menu, the system will begin calculating the toolpath.
Post Yes/No - This option allows the user to determine whether a feature in the CAM tree will be included in the code that is posted by the system.
Mill Thread - Right click on this item in the CAM tree will produce a pop-up menu with two options for modifying the visibility and color of the toolpath that is created:
Color - When this option is selected from the pop-up menu, a dialog will appear allowing the user to change the color of the selected threading toolpath.
Blank - When this option is selected from the pop-up menu, the system will hide the selected threading toolpath if it was previously hidden or show the threading toolpath if it is visible in the Workspace.