Lee_asdf, No there isn't. What you can do, however, is encode those WMAs into MP3 first using Any Audio Converter. Afterwards, you can import the MP3 into Audacity for editing.
You'd be better off converting WMA to WAV to import it into Audacity. Avoid lossy to lossy conversions when possible. MediaCoder says it can. All bets are off if you're trying to do this to eliminate DRM however.