You are right, Write to Measurement looks for a path. I need to let different people choose the different section of a path (like I posted before, let higher level operator choose base path, and let lower level operator choose a relative path), after that, the file will be generated with different names based on the different working conditions. The file name are like these: Lowspeed-2016-07-18-0110,Highspeed-2016-07-18-0111, Highspeed-2016-07-18-0112, Lowspeed-2016-07-18-0113,... Now I need to build the different path under different working conditions firstly, and then wire it to the Write to Measurement. Since all the files share the same path but with different file names, so I am thinking is it possible to give Write to Measurement a base path, and use its dialog box to define the series file names, but it seems Write to Measurement doesn't have such an option. So now I used case structure and build path to realize this function.
