How to make changes to a pre-existing rate and coverage calculation of a Benefits Plan?

I am trying to change the calculation method of coverage and premium for a Benefits Plan. But nothing that I am doing is changing the coverage and premium amount that is getting reflected in the employee's Benefit Summary. I have tried fast formulas and also changed the multiplier for the coverage calculation, but still the amount does not reflect any change. Is there anything else that can be done in this case?