stair modeling

[anho28]

 

  Can anyone help me why can I only draw the straight stair? When I try to turn 90degree to make the U stair it shows like that and doesnt work. Thanks

[Christophe Fortineau · Accepted solution]

Hello anho28,

Try placing the reference line in the center of the staircase rather than outside, and also modify the value marked by a "?" and the one marked by a red arrow into my picture.