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You are going to have to be more specific about your problem. When you start the DAQ Assistant, info on selecting multiple channels is displayed and once created, there are two 'Add' buttons prominently displayed.
It depends on how you want to do it. If you want to create native Excel files, then you can use the Report Generation Toolkit or look through the forums for ActiveX Excel examples. There are thousands of posts on the subject.
If you just want to create a file that Excel can read, the easiest way for a beginner is to use the Write to Measurement File function.