We are using .txt files to list units in ME's. I think the GM's decided Excel was more trouble than any benefit it had over plain text files.
Higher command doesn't really get involved in your battles. As tactical commander, when the unit you are in charge of comes in contact with the enemy, the GM's will set up a battle between you and the enemy commander. You will go into it with instructions and a goal from your Divison/Corp Commander, but it will be up to you to carry out your orders and achieve your objective, be it attack, defend, probe, delay, or whatever.
Battle reporting is between you and higher command. Significant developments and an AAR at the end are typically what gets reported.
As soon as you have access to the rest of the forum, you'll be able to see a lot more of the process.