In EPBCS MDX Outline formula, is there a way to use the Except Function after When IS Function?

For example I have the below Account formula and it shows values for all brands within Pillar_220, yet I want to exclude certain brands (that roll up to other Pillars). Can I use Except to do this and what is the syntax?

FORMULA

WHEN IS ([Scenario].CurrentMember,[OEP_Forecast]) AND ISLEAF([Item].[Total Item].[All Item].[Pillar_220].[1415].[1415 Input])

THEN

([Account].[OFS_Financials Accounts].[OFS_Expense Planning].[OFS_Total Expenses].[60000].[60100].[60200].[60300].[60330])