Nitrof,
I agree with Jean-Pierre, we need more information. However, here is what I can tell you from what I understand so far. You have a list of doubles in a text file. You want to read those doubles into an array. You wish to use four doubles at a time in a cluster to run your subVI. Is this all correct?
If it is, then I suggest using the Index Array function in a loop to create the clusters. Or you could just read in 4 doubles at a time from the file and process as you go. There are many options, it just depends on your preferences and needs for your application.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask