For this, first you need to activate Mondrian as XMLA Provider... try following my article :
<?xml version="1.0"?>
<DataSources>
<DataSource>
<DataSourceName>Provider=Mondrian;DataSource=AccessTest;</DataSourceName>
<DataSourceDescription>Mondrian FoodMart Data Warehouse</DataSourceDescription>
<DataSourceInfo>Provider=mondrian;Jdbc=jdbc:odbc:MondrianFoodMart;JdbcDrivers= sun.jdbc.odbc.JdbcOdbcDriver;</DataSourceInfo>
<ProviderName>Mondrian</ProviderName>
<ProviderType>MDP</ProviderType>
<AuthenticationMode>Unauthenticated</AuthenticationMode>
<Catalogs>
<Catalog name="FoodMart">
<Definition>/WEB-INF/queries/FoodMart.xml</Definition>
</Catalog>
</Catalogs>
</DataSource>
</DataSources>