Is it possible to make notation for multiple-line commands in procedure at a time?

We know that we can use "//" to note/invalid single line code in procedure. But how to inactive multiple line codes at a time? Thanks!
1) Mark all the code line yo want to commentize (inactivate)
2) Select from the top menu: Edit => Commentize (or press Crtl+/)
(Note: This will just automatically put // in front of all selected lines)
In a similar way you can decommentize (activate) multiple lines of code.