Which code/variable to look for to reset hearthfire Northwing extentions

When you join a "college" or a "group" like Winterhold Academy or company in Windhelm, they give you a "dorm" room.

When you notice that some room might be yours open the console (tilde key) click on wardrobe to select it and type IsOwner and you should see who it belongs to exactly. If it is you, then it is a safe place to store your items.

Also to make sure you can put item in container and go away for 48h that is the time items know to disappear.

Note:aiming at bed and seeing if it is red or not is easy and quick way,but it is not the most accurate since you can sleep in some beds even if you don't own the cabinets...

I'm not aware of a way to use variables, but it is possible to create function-like batch scripts.

This can be done by creating an ordinary text file containing the commands you wish to run together (one per line, CRLF, no other delimiters). Save this file as e.g. myscript.txt in your Skyrim folder (in the same location as TESV.exe). In-game, you can then run this script via the bat console command:

bat myscript

Unfortunately, this does not appear to support arguments, so cannot be parameterized.