IF you have the angle just go to the MDI page and input the angle into the LOCAL SYSTEM ROTATED dro. That will automatically rotate the system for you. IF You first go to the rotation point and then mach will rotated it aound that point .

To undue the rotation just input ZERO into the DRO.

Gcode wise you use the G68 code. You can rotate the system around the current point G68 R45 OR you can rotate the system from a KNOWN point G68 X1 Y1 R45.

(;-) TP