declare @MetricType char(1);
set @MetricType = 'P'

declare @Frequency varchar(100);

if @MetricType = 'P'
begin

	select @Frequency = '<above statement>'
end else
if @MetricType = 'o'
begin

	select @Frequency = '<below statement>'
end


print @Frequency

CASE WHEN M.MetricType = 'P' 
	THEN CASE WHEN NU.FromFrequency = 1 THEN 'One'
				WHEN NU.FromFrequency = 2 THEN 'Two'
				WHEN NU.FromFrequency = 3 THEN 'Three'
				WHEN NU.FromFrequency = 4 THEN 'Four'
				WHEN NU.FromFrequency = 5 THEN 'Five'
				ELSE '' END +' '+'to'+' '+
				CASE WHEN NU.ToFrequency = 6 THEN 'One'
				WHEN NU.ToFrequency = 7 THEN 'Two'
				WHEN NU.ToFrequency = 8 THEN 'Three'
				WHEN NU.ToFrequency = 9 THEN 'Four'
				WHEN NU.ToFrequency = 10 THEN 'Five' END +' '+
				CASE WHEN NU.ToFrequency = 6 THEN 'time' 
					WHEN NU.ToFrequency = 10 THEN 'times Or greater' 
					else 'times' END 
	WHEN M.MetricType = 'o' THEN CAST(NU.FromOperator AS VARCHAR) + ' ' +CAST(NU.FromFrequency  as varchar) + ' ' + CAST(NU.ToOperator as varchar) ELSE '' 
END AS Frequency