There are a few things you need to know if you want to copy a line in Illustrator. First, the line must be on a layer, and secondly, it must be in the same color as the text. Here’s an example:

  1. Choose the Line tool and click on the line you want to copy.
  2. Drag the line up or down to change its length.
  3. Choose another color for the copied line and release it.