Break it into multiple procedures and ditch all the ELSE statements, you don't need them and they're making things more complex
IF (@Var = 1)
EXEC PROC1
IF (@Var=2)
EXEC PROC 2
...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability