I input all my military flights into logbook pro.

In aircraft ident, I have the following:
Navy/Marine, used the BuNO, normally a 6 digit number 162348, 161412, etc
Army/USAF is logged on tail number, 10-00386, 85-2444 etc
(logic is that Navy tail numbers are repeated in squadrons, and aren't tied to the airframe)

Any other stuff just gets N123AB numbers
Sims get a "description" Like Model is BE300 and identification is CAE-BT-D (CAE's BT sim, Level D) or POT-FTD-B (Potomac FTD level B)