Line features could have common attributes, eg line id or line name. The total length of a line by the common attribute is used to calculate against another translation, e.g. clipper. Lines outside clipper will reduce the total lengths to multiple line features of the same name and these collection of featured can then be calculated against the original length of the line to determine of percentage that are outside the clipper.
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Adding GroupBy on LengthCalculator
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+7- Contributor
Have you looked at a list builder (grouping by common columns) then a list summer?
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