1. Fix the sheet metal on the bending machine according to the drawings or requirements, and adjust the bending angle and length to the correct position.

2. According to the position and direction of the dotted line, draw the actual bending line below the bending line with a marker or other tools.

3. Bending the metal plate along the actual bending line usually requires the use of professional equipment, such as a bending machine.

4. Check whether the bent metal plate meets the requirements, including angle, length and shape. If necessary, subsequent finishing or machining can be carried out.