GML Possible? txt file: Read Part of Line & Copy, Later Read Other Half of Line & Copy

When reading from a txt file is it possible to read only a certain number of characters from a line copy that part only then later (on a different frame) start reading from that line at the place you stopped and copy that part only. This would be to prevent slow down if a line was excessively long but still allow it to all be read.
 
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