In the 3D, Section/Elevation and IE windows, you can modify the height of selected elements graphically with Stretch height command of the pet palette.
Click a node of a selected element and choose the vertical stretch icon in the pet palette. A ghost contour of the element follows the cursor. Click to set the new height of the element.
Relevant topics
Toplinked Stairs and Changed Story Height
Like Walls, Stairs can be linked to Stories, and so can follow changes in floor height.
See Stair Toplink.
If the Story height changes only by ...
Height
This node outputs the standard Height parameter of a GDL object. You can modify this value in ARCHICAD on the Preview and Positioning tab page of the object's settings dialog. During editing you can set the default value in the bottom left corner of the editor.
Outputs
...
Sill Height Using Subfloor Thickness
Use the Subfloor Thickness field, in the Dimension Marker Panel of Door/Window Settings (or the Info Box), to fine-tune the marker display of your ...