By clicking on an LPL, all open timetable views are switched to the teacher or class of the LPL. You can drag the LPL into the timetable or into the scheduling dialogue where it creates a special duty. Keep in mind that the timetable or the scheduling dialogue is set to the week in which you want to schedule the LPL.

In the substitution window, the scheduled LPL is marked with the type "Spec.duty for the LPL" or as "Shifting" if this LPL originates from an obstructing lesson.
In the box "Scheduled periods" you can see at what time the LPL was scheduled.

If you move the LPL in the scheduling dialogue, all occupancies of the teachers and classes involved are displayed just like you know it already from drag&drop in the scheduling dialogue.
Hint: Scheduled LPL's
As soon as you complete a shift via the lesson pool, the LPL is deleted. In all other cases the scheduled LPL remains in the lesson pool window.