Actually, I thought of an even easier way, but I’m not near my computer to show an example. Set the sub-interval to whatever your sample shows (e.g. 5 min), find the letter/block that corresponds to the start time of each session, then right click on that block or letter to split the TPO. You can split the TPO at the open of each session. Again, you’d have to do it manually each day as far as I know.