Set up formula business rule

Today I saw in Creatio 8.2 something long awaited to be available in Freedom, the rule that allows you to designate a formula to a field.

But :-( when trying to designate a formula to a field, it doesn't allow me to do so and apparently what I saw is ‘on hard’ and it is not possible to add this element to our business rules yet.

I saw it in the OrderProduct object to calculate the total of an order line, you can change the formula, but not add a new one, because the ‘Set up formula’ element is not accessible.

Does anyone know how to access ‘Set values’ using formula?

Thanks

Julio