To build a wall assembly on a column

Select ( Build Assembly On Column ).
Complete tool settings and select a part definition.
1. (Optional) In the Build Assembly On Column tools settings, check both Graphic Group and Match Form Height.
  This ensures the assembled wall components will maintain their graphic group relationships, and their heights will be the same as the selected column regardless of the heigh specified by the part definition.
2. Leave the form width By Part option checked.
  Note: The form height By Part was disabled when the Match Form Height option was checked.
3. From the Family/Part Toolbar, select an appropriate part definition.
  This ensures the assembled wall components will have widths specified by the part definition.
Select a column form.
The selected column form highlights.
Enter a data point away from the geometry.
A form is placed against the column along the selected edge.
Repeat for remaining sides of the column (if rectangular).