short code for setting the forwarding number.

[AlfonsoSF]

I'like to program an auto attendantm for forwanding the recepcionist calls to a cellular.
When any of the two recepcionist call to the office, the call is forwarded to this auto attn.
I want to set up the phone number for forwarding the calls which ring in the recepcionist extension via short code.

How can I set a short code for setting up the forwarding number for this extension only?

Thanks in advanced!