1. As written above, do a one line entry.
2. Do a conservative entry for cross country time. I think I figured 50%.
3. Get familiar with the FAA logging of flight time. For example, if you are receiving dual in an aircraft which you are certified to fly. So when you get your instrument airplane after your private airplane all that dual time is logged as PIC even in IMC.
Another example, you can log multiple conditions with the FAA, so night AND IMC, not one or the other like the Army.
4. Get a computer logbook program to supplement your paper logbook. This will greatly help you to break down flight time for airlines. Try to find one that will interact with crew scheduling software such as mccPilotlog. I use this one and it is very easy. I synch it once my schedule comes out and all my trips are populated. Once I finish a trip I synch again and the times for that trip are automatically populated based upon my out/off/on/in times. It even automatically figures when you have night time. All I have to do is plug in instrument time and approaches.