The components on a Sequential Function Chart (except comments) are connected by connection lines. These lines connect the connection boxes of steps to those of transitions, and they also connect steps to actions.
To create a connection line, simply select a connection box, then drag the cursor to another connection box. When you release the left-hand mouse button, the connection is drawn.
NOTE: An invalid symbol is displayed in place of the cursor if the connection you are attempting to make is invalid (for example, if you are trying to connect a step to another step).