Hi Amit,
According to me, it can be made available by using a master warranty
OR
another way is to have a user status against each EQ or FL which will check if the equipment is under warranty or not. You need to take ABAP help to code in such a way that, if a warranty flag is green the user status of that particular FL/EQ should be set automatically. So using IL05 OR IE05 you can filter out all under warranty equipment or functional locations.
Regards,
Amol