STAIRCASE BEAMS IN MODEL

HI FRIENDS I AM ANALYZING A STILT+4 RESIDENTIAL BUILDING AS PER "IS CODE". I USE TO BREAK MY COLUMNS AROUND STAIRCASE IN LEVEL OF MID-LANDING & ALSO IN FLOOR LEVEL ONLY IF SLAB CONTINUES IN FLOOR LVL.COZ I USE TO CALCULATE STAIRCASE LOAD AND APPLY IT IN MID LANDING BEAM.

I WAS ADVISED BY MY COLLEAGUE NOT TO BREAK COLUMN IN MID-LANDING LEVEL,  SINCE IT MAKE THE COLUMN TO BEHAVE AS SHORT COLUMN.  

KINDLY GUIDE ME WITH PROPER WAY TO ADD STAIRCASE & ITS LOAD TO THE MODEL.