In my logbook I have only 2 colums, labelled Instrument - in flight, and Instrument - ground.
Instrument - ground is when I am doing training in the simulator or being examined by someone, such as my OPC and LPC.
So I guess in my case, I would need to log these sim instructional hours, when I am teaching, in some section in the back of my logbook!
Where do others put these hours?