I'm used to calling subflows in UCCX scripts to hand another script input and then retrieve the output and continue on my way using the original script.  But in CUE, how can I simply hand a call to another script (that has no extension tied to it)?  For example:

A user calls the main number and hits script A.  If they press 3 I want it to hand this call off to script B and should cease using script A.  Script B does not have an extension tied to it.  The only way a caller should be able to get to Script B is by pressing 3 on script A.