Generating 64- QAM signal in ADS to simulate transceiver systems

Dear ADS members

I need to generate 64-QAM signal in ADS schematic to simulate a transceiver system. There is an example in ADS with 16 QAM. Could anyone be kind enough to show me the way to do it? The example of 16 QAM can be found in the design guide of ADS with path 'Design guide>RF system>communication example> 16 QAM'

Thank you in advance