Hi Imran,
Maintain the Fiscal Year Variant Manually...it would be K1 or K4..based on you ECC Configuration...or you can check with FI Consultant.
Copy the Cube as ZCOPA1 and check the cube dimensions if it satisfies your requirement...and if not then as advised by Sander ..go fr a New cube or add the required Dimensions/Objects to your newly create cube ZCOPA1.
rgds
SVU