Not really.. because the response time is generated in Analysis.. we are getting the total response time right now. for all 6 servers. I can not declare a variable for that.. there should be a LR command that would do this.
For existing results, you could sort the raw data by time, if you know the time boundaries.
For future, you might think about duplicating the action section such that each action section represents interaction with a different server. This allows you to rename the transactions by section - to the appropriate server. Then to assure a proper sort of the transactions you would enforce a naming convention such as:
SERVER_nnn_Transaction, where SERVER corresponds to the server being interacted with in a specific action section. "nnn" is a numeric string "000" to "990" in increments of 10, and "Transaction" is the name of the transaction relative to the business transaction.
I have created variable transactions names. If you are controlling what server you are going to you could use this for the future as well. I would create a parameter file with the server names and modify the code below a little.