Draw multiple lines

I have implemented a draw line solution that I found at Draw a line on mouse movement - Questions & Answers - Unity Discussions

The problem is, every time I go to draw another line, the previous one disappears, and only allows one line at a time to be on screen. How would I change this script to not delete the previous line(s)?

Make a List of VectorLines, and add a new VectorLine to the List when the mouse is clicked.