Getting error while using 3 nested if functions - Any changes i need to change ?

You have some unnecessary brackets in your code. Adding the correct syntax below. 

if(
  local!val=1,
  35,
  if(
    local!val=2,
    45,
    if(
      local!val=3,
      55,
      65
    )
  )
)

Anyway, I would recommend using a!match() now instead of nested if(). 

You have some unnecessary brackets in your code. Adding the correct syntax below. 

if(
  local!val=1,
  35,
  if(
    local!val=2,
    45,
    if(
      local!val=3,
      55,
      65
    )
  )
)

Anyway, I would recommend using a!match() now instead of nested if(). 

It works as expected , Thank you harshit 

Great Job