Breaking (Dividing) Lines
The break tools allows for a line or object to be taken and broken into separate the selection pieces. One break tool is visible in the Edit toolbox however there are a number of additional tools nested underneath.
More:
Break Lines at Closest Intersection
Break Line at a Location
Break Two Lines at Corner Intersection
Break Lines Between Selected Lines
Break Line(s) at the Intersection of Another Line
Break Lines Into ānā Number of Equal Segments
Break Lines at an Incremental Distance
Break Lines at a Specific Length