You can find any tool by the Menu Structure HERE: https://turbocaddoc.atlassian.net/wiki/display/TC21UG/Menu+Structure

You can find the menu location of any tool by name HERE: https://turbocaddoc.atlassian.net/wiki/display/TC21UG/Tools+Mapped+to+Menus

Double Line- Polyline

  
Creates a series of connected straight double line segments (no arc segments) that comprise one object. For the interaction, see Polyline.