Chose Fx for Strike and in Fx
Round (LTP(NIFTY50), Base 100) + Round (Math Operation, Base 100)
In Math Operation for Number1 and Number2 both select Traded Instrument and operator “+”.
Now click on First Traded Instrument and point to the CE leg taken, keeping ‘Field’ as price,
Same way you can do for PE subtracting.
Note : This will first Round LTP of spot and then Round the sum of premiums and add together.
If you want all three added without rounding first and round finally to base 100 then it should be done with Single Round function. In Round function first chose Math Operation and base 100. Then in this Math Operation chose Number1 as LTP and Number2 as Math operation again and “+” operator for CE and “-” operator for PE.
Then in second math operation choose instrument prices as described above.