For your first question, I have a total of 149 observations. I don't understand the point in adding 63 variables for each observation. Do you intend to keep the 63 variables unchanged for the 143 observations that are not of interested and have a different value for the 6 other observations? For the second question, I believe you could refer to the subjects as 1, 2, 3, 4, 5, 6. Are you wondering if maybe in the future I will only be interested in 5 subjects or may 15 subjects? A program may be easy to adjust if that is the case.
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