The "AI Multi Pt" sounds like an old Traditional DAQ example. The DAQ Assistant uses DAQmx, and it hides a lot of code. This is both good and bad. Good if you don't need to change anything. Bad if you do. I don't know the way you've set up the task, but you can do what you want by simply using the DAQmx VIs directly. There are many examples that ship with LabVIEW. Open the Example Finder (Help -> Find Examples) and navigate to the Hardware Input and Output -> DAQmx -> Analog Measurement. I'm not sure whether you need to go into the Temperature directory or the Voltage directory because like I said, I don't know how your task is set up.
Let's take a simple example. If you open the "Acq Themistor Samples-SW Timed" in the Temperature directory you can see it's pretty simple. The very first VI is the DAQmx Create Channel VI. This has a "physical channels" input. This can be a DAQmx control or it can be a string where you specify the list of channels to collect. So, to do what you want you just need to create the string corresponding to the channels that you want to collect. The LabVIEW Help describes how to create this string. The alternative method is to use the technique that aestat shows. However, what's shown is only part of what you'd need to do. You would need to have a pre-created array of the channels and then you need to select the ones you want.
See attached example (LV 8.2) for an idea.
