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
Arc Complement
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Reverses the start and end angles of an arc. In other words, the arc will become the portion of the original circle that was cut.
- Select the arc you want to modify.
- Click anywhere to create the arc complement.
Tip: When using this tool on arcs that are the result of exploding a polyline, or created as the result of using the Arc Divide option of the Edit Tool, this tool may select more than one arc at a time. If this happens, move the arcs from each other.