how to define a snowflake model

[高扬02]

Kylin 2.5.
How to define a snowflake model ? I did not find the place to set it.
I have two fact tables , now I must create two cubes , and query “cube join 
cube”.
To query the raw data of the measure column for “join” sql ,Now I set the 
measure column to be the dimension column also,because it takes too long to use 
the “query-push-down”.
Please show me where to define a snowflake model.
thanks.