the idea was to have 1 BFL miner and 5 block erupters working on 1 pool and 1 BFL on another pool...
In one CGMiner instance use
"--usb ICA:5, BAS:1" This will use the 5 BE's and one BFL ASIC. Note the ICA:5 isn't really needed as CGMiner would use them with no command line options.
In the other instance use
"--usb ICA:0, BAS:1" This tells CGMiner to use NO BE's and 1 BFL ASIC.
This is why I asked what devices you wanted to disable. The other post's suggestions would work great for GPU's, but not so well for ASIC's.
These usb options are explained in the Readme under Advanced USB Options.
Sam