Buttweld toolbar: Plan Wye 
Victaulic toolbar: Plan Wye 
Command line: YB
Places a wye in the X-Y plane.
last point
Starts the component at the last point of the previously-created component.
Middle
Places the wye at the centerline intersection of the main and the branches of the wye.
Branch
Places the branch of the component at the start point.
otherEnd
Places the start point of the component on the other end.