Using 3 sets of NI9162+NI9263 with CVI

I am looking to use 3 sets of NI9162+NI9263 with CVI, outputing 12 analog lines.  The example I find only has 1 line.  Please help.
The example I look at is:
.....NI-DAQ\Examples\DAQmx ANSI C\Analog Out\Generate Voltage\Cont Gen Volt Wfm-Int Clk

I need help again.  In the [ MultFreqContGen-IntClk.c ], this line does the configuration of the task:
DAQmxErrChk (Configure_ContGenPerWfmIntClk (chan, min, max, rate, &numChannels, &taskHandle) );
Inside the Configure_ContGenPerWfmIntClk() function, which is found in [ MultFreqContGen-IntClk_Fn.c ], this line gets the number of channels and writes that to the pointer numChannels:
DAQmxErrChk (DAQmxGetTaskAttribute (*taskHandle,DAQmx_Task_NumChans,numChannels) );
Is the number of channels not supposed to be determined outside and assigned to the child function?  The parent function should have this number from all the user-input values.  Why am I seeing the child function deciding the number of channels.  I do not understand this.

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