How does Cut work?

#1
In Take Command's Edit menu, there is a Cut command. I highlight text on the TCC command line (in a tab), but Cut is disabled. How do I enable it? Is there a way to cut text at the command line (preferably using a keystroke)? I have Linux-style selection checked, if that matters.

TCC 17.00.77 Windows Vista [Version 6.0.6002]