Ability to import updates to Benefits

Benefits often don't run tax year to tax year so mid way through there may be a change to the benefit ie if the client goes with a new provider there may need to be an end date added or there may be a change to the value when a new benefit year begins - currently we can import the benefits, but we are unable to import changes ie if the value is to be updated the import adds whole new line rather than updating what is there and we have no ability the update the existing benefit via an import which for a larger payroll would be very helpful as manually chaning values on each employee is very time consuming