Can we add additional Rate member under Entered Exchange Rates

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We are trying to calculate Current Year Actuals at a certain Budget Rate (CAD conversion Rate) given by the Executive Team. This is very similar to Average Rate & Ending Rate concept in FCCS. However, we don't want to enter the Budget Rates for a new Scenario at Average or Ending Rate because the business is very hesitant to do it as it's huge Audit item.

Is there a way to create a new member under Entered Exchange Rates and use that member for this Budget Rate and do the currency translation? I'm not sure if we add new member the backend rules/scripts will be able to pick up the new Budget Rate.