Call this script from a workflow transition post-function. It will set the approver based on the value of a custom field.
The keyword “fruit” in the script below represents a SIL alias which is the best practice for access custom field data. See Custom Fields Aliases.
if(fruit == "Apple") { customfield_10700 = "jmuse"; } else if(fruit == "Orange") { customfield_10700 = "efoulkes"; } else if(fruit == "Peach") { customfield_10700 = "jwang"; }