I have a feature with hundreds of lines and I need to extend all the lines of a given distance (for example all of 100 meter).
Is there a function in ArcGIS to do it automatically?
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I am assuming that you are using the ArcMap application of the ArcGIS Desktop product. You have tagged the latter, but then you have supplied a link to ArcGIS Online within your question body.
To so this I think you should test the Extend Line tool which:
extends line segments to the first intersecting feature within a specified distance. If no intersecting feature is within the specified distance, the line segment will not be extended.
If this does not meet all of your line extending requirements then you may want to include a picture and description of one requirement that it does not meet within your question.