SO2:Stairway

A staircase can be created two ways:

The first way is to create an individual floor block for each step. Each step height increased for each step

The second way is a lot easier. In the Wall Features, add feature and select the Staircase Preset. All you need is:

Step Count the total number of steps

The dimensions of each step. This is the width, (Horizontal), and the depth, (Vertical), of the step

Height of each step or total height to define the height of the stairway feature

Note: Make sure that the ceiling has a void to cope with the staircase