Hi Save,
"Can you use SSIS and create a job to extract the data from the cube.and then use it to write a SQL in the SQL transform in bods."
Means, you extract the data from your source system with the help of SSIS package/job. And then once you have this data in sql database you can write a query on top of this for sql transform in BODS and process it further.
Regards,
Gokul