RTC v6.0.4: Create Short String Cost Field for Currency
Accepted answer
I don't think you can "re-format" a string by using an editor presentation. Your best bet is to use the Decimal attribute type and the Decimal presentation. I can't find a way to put the dollar sign right next the text box. You may need to use a validator to force users to use at most two digits after the decimal point, or you can try to use the script to round it up automatically.