Like many players here (I guess) I have money in accounts at more than one poker site.
Currently I treat each account as a seperate BR. As I play by a fairly conservative BRM, I will only play at a level on site A if my BR on that site allows. This is despite having perhaps 3-4 times that BR on site B which allows me to play at a higher level on site B.
If I was to treat all of my accounts as one BR I could perhaps move up a level even on the site where I play the highest.
I don't plan to change how I do things as it allows me to gradually get used to the different play on a new site before I look to play at higher levels. There is also a certain 'comfort' factor involved - I would not be comfortable to see myself putting 30% of my roll on site A on one table or into one tourney even if for my combined roll it would only be 0.5% of my total.
I am interested however in how others here treat their BR(s). Do you treat them all as one BR or as completely seperate BRs?