Hi jiam912,
In your original sample input, there were groups of 5 lines (10 lines total in the sample). In your latest sample (attached to post #6), you say that there are groups of 6 lines (30 lines total in the sample).

I asked if there are always a constant number of fields in a group of lines. You have not answered that question.

I asked how we are supposed to determine which line is a first line of a group if there can be a different number of lines in a group. You have not answered that question. And, as pointed out in the first paragraph above, the number of lines in a group in your samples is not a constant. Without a clear answer to how you determine that a line is the first line of a group, I have no idea how we can help you solve your problem!

I asked whether or not the number of fields within a group of lines is a constant. You have not answered that question. The number is a constant in your samples, but without a clear specification of your input file format, I don't want to make any wild assumptions that will invalidate any suggestions we might provide. If the number of fields within a group is lines is not a constant, I asked what default values should be provided for fields that are not supplied in a group. You have not answered that question.

If you won't give us a clear specification of your input file format, don't expect us to waste any more time guessing at code that will likely be invalidated by your next post with a new sample input file format.