You can split an existing cable's or channel's wireframe segment into multiple segments.
To split a segment,
1. Click Cabling and then, in the Modify group, click the arrow next to More.
2. Click Split Edge. The Split Edge dialog box opens.
3. Click the edge to split.
4. Either click a split point on the edge (creating a vertex at that point), or select one of the following options and split the edge as described:
◦ Midpoint: a vertex is generated at the midpoint of the edge or 3D curve, creating two equal segments.
◦ Segments: Type a positive number that specifies how many segments of equal length are created. You can also enter non-integral numbers. The decimal produces a smaller segment proportional in length to one of the "whole" segments by that fractional value. For example, splitting an edge into 2.5 segments produces two equidistant segments and one segment half their length.
◦ Length: Type a positive number that specifies the split point measured from the begin point of the edge. Type a negative number that specifies the split point measured from the end point of the edge. The begin and end points are labeled with their distances when you select this option.
Split Edge. The Split Edge dialog box opens.
to complete the operation.