I have a situation where in there are two stations A and B respectively that processes parts of types C and D. Part C goes to station A and part D goes to station B. If two Parts are available to enter on to both stations A and B then the overall processing time will be ''x'' seconds for both the stations and the cycle starts when both the stations are loaded in this case. Suppose if there is only one part type i.e. either C or D which is ready to enter only one respective station then the processing time will be ''y'' seconds. Could anyone help me simulate this scenario.