Problem in writing Fox Formula

Hello All,

I need to write a formula to fill values in the key figure.

The value is to be sum of other two input ready key figures.

ex a = b +c ( B and c are input ready key figures)

To implement this i have to write a fox formula in planing function.

I am new to Integrated Planning.

Please let me know how this formula will be written.

Regards,

Pratighya.