WITH MEMBER [Measures].[Count Severe ÷ Count N/A] AS '[Measures].[Count Severe] / [Measures].[Count N/A]', FORMAT_STRING='0.0%'
MEMBER [Measures].[Count Severe] AS '([Measures].[Count], [Severity.By Severity].[All Severity.By Severitys].[Severe])'
MEMBER [Measures].[Count N/A] AS '([Measures].[Count], [Severity.By Severity].[All Severity.By Severitys].[N/A])'
SELECT
 NON EMPTY {[Measures].[Count Severe], [Measures].[Count N/A], [Measures].[Count Severe ÷ Count N/A]} ON COLUMNS, 
 NON EMPTY [User.By Company].[Company].Members ON ROWS
  FROM [Usage]
  WHERE ([Task.By Application].[All Task.By Applications].[CRM].[Prospecting].[Create Prospect])