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
Perpendicular Snap
SEKE: J
Connects a line to another line so that the two lines are perpendicular.
- Select the first endpoint of the line. For the second endpoint, move the cursor over the line to which the new line will be perpendicular.
- Press J.