Yes, Balance can do this. Do not have the docs in front of me, but this feature is called 'seed list'. The format should be in the docs, but the easiest way is to put a few different devices into Balance, and export the seed list to see an example of the format.
Peter is correct, The Seed list instructions and a .txt example is actually detailed in the help menu of Balance. The Seed list option is only for "Physical" servers and not VM's. And lastly, even if you already added a proxy server to Balance you will still need to specify the "proxy" name in the seed list for the discovery of "Windows" platforms.
The seed list will error if there is something missing with an error of "Line 5 missing blah".