Just because it was done, or you can, doesn't mean you should. I doubt the advise given in this thread will help sway you but in case it doesn't let me add to what has already been provided.
RBTA's, or any BTA for that matter, will naturally propagate as Mother Nature intended. It may not be at your speed or pace but it will happen naturally. I started with one in a 29 gallon bio cube and within a year had 2. Few months later 3. Moved one to another 29 gallon biocube and it split. Now I'm at 4 and tired of managing 2 tanks so combine them both into a 40 breeder. About a year goes by and I'm at 6. Then 7, then 9, give a few away, then said enough and planned an upgrade. 210 gallons later I'm at 12. I thought I had it bad then started to look at others and I saw a few that split so many times naturally (no feeding, healthy tank, etc) that they became plague proportions much like Xenia.
My point in this is is two fold. You can't speed up Mother Nature. Just because you can doesn't mean you should. More importantly is if you are considering this for residual income BTA's are pretty common regardless of what people call them. Personally I wouldn't attempt a forceful split. There really is no reason unless you are being impatient and that is a bad trait to have in this hobby (not directed at you just a general observation in our hobby).