Dear All 
  
As salam alaikum, 
  
In my case I have a footing for neck column(This neck column is upto tie beam level only), The tie beam tied to this column is supporting a FLOATING COLUMN. FLOATING COLUMN is resting on the edge of the cantilever of tiebeam. 
  
I want to know what moments  shall I consider for footing design, shall i take the column bottom moments or shall i take column top moments which is from cantilever tie beam. 
  
Kindly provide me your valuable suggestions. 
  
For your referrence kindly find attached footing & tie beam layout.Structure.dwg 
fdn layout.pdf 
tie beam layout.pdf