Can Brushless DC Motor (BLDC) be used as Stepper Motor?
YES
But you would have to add pulleys and belts made for steppers to reduce the ratio like 64:1  because a stepper may have 64 poles /rev as full steps while a BLDC might be 2 or 3. Then you may have to adjust holding-current to limit heat rise.
The gearing ratio depends on diameter ratio but can  be cascaded and made to standard loops of belt or any linear length with end stop switches added.