Hmmm, against my better judgment I'll reply to that, but it's only because I'm feeling seasonal!
FXCM Sales told you "with two seperate entry orders you are not able to automatically cancel one by the creation of hte other " which is true, why would you want to set 2 entry orders and cancel one if the other was filled?
OCO's are primarily for use when you have an open position and want to set stop and limit orders. On the CMC platform you have to set up the OCO manually by linking the two orders, on FXCM the two orders are linked automatically, in effect the result is the same on both platforms, the difference is FXCM do it for you ie If your stop loss order gets filled your limit order gets cancelled and visa-versa.
Here's an example, probably for a long Eur/Usd position from something like 1.1285:
Over to you Einstein....
Mick