How can I design tunnels by using SAP2000?

TO SOLVE TUNNEL DESIGN BY USING SAP2000 YOU HAVE TO USE API TEQNIQUE ( APPLICATION PROGRAMMING INTERFACE ) THIS TEQNIQUE IS A WAY TO CONNECT SAP WITH EXCEL AND VISUAL BASIC SO YOU CAN DRAW THE PATH OF THE TUNNEL WITH THE TOTAL SHAPE AND CAN INSERT ALL (XYZ) COORDINATES LOCATED FROM SITE TO SAP2000 HAW CAN WE DRAW THE TOTAL TUNNEL SHAPE IN SAP2000 WITH API I CANT EXPLAIN HERE BECAUSE THE AREA CANT GIVE ME WAYS TO SHOW FIGURES AFTER WE DRAW THE TUNNEL IN SAP2000 WE HAVE TO DEFINE MASS MATERIALS IN EVERY SECTION IN TUNNEL BY USING DEFINE LIST AND THEN DEFINE MATERIAL AND PUT THE MASS WEIGHT IN EVERY CROSS SECTION IN SAP2000 AFTER THAT WE HAVE TO PUT THE DISTRIBUTED LOADS AND CONCENTRATED LOADS IN EVERY CROSS SECTION IN TUNNEL AND TO SEE IF THERE IS EARTHQUAKE LOAD TO PUT THEN BEGIN TO DESIGN AND GET MOMENT AND SHEAR