Enable Sandboxes in OEP_FS

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Hi All,

Can we enable sandboxes for module cubes like (OEP_FS, OEP_WFP) etc or custom cubes like plan1 only? since we are planning for revenue and expenses in OOB financials, we need using it only in financials (OEP_FS). If this is not possible, how we can leverage the custom cube (Plan1) to update the numbers in OEP_FS? is it through Data maps and xwrite ?

Could you please provide us with a clear process flow, how we can leverage sandbox functionality between OEP_FS and custom cube as this is our first implementation using the sandbox feature.