When an assembly contains mechanisms like linkages and actuators that change position during the physical operation of the assembly, these may be defined as alternate position members in the alternate position assembly model. When you use the Drawing View Creation Wizard to create a drawing view of the assembly, the Alternate Position Assembly tab is displayed for you to choose the different positions you want to show in the drawing view.
Member Name
Displays the names of alternate position members defined in an alternate position assembly. You can click a member name to see what the member position looks like in the preview pane.
Primary
Selects a member as the primary member in the drawing view. One primary member is required.
The primary position parts are auto-ballooned when you create a parts list and are shaded when you apply shading and grayscale.
Alternate
Selects one or more additional alternate position members to display in the drawing view.
Note:
After the drawing view is placed, you can select the Set Primary and Alternate Positions command on the drawing view shortcut menu, and then add and remove members from the view, and change primary and alternate position designations.