SC custom fields to BI reporting

Hi Experts,

I have added few custom fields to SC both at header level and also at item level. Now we would like to extract this data into BI for reporting purpose. Can you guys help me to understand is there a standard extraction structure for these custom tables or we have to define new Z extraction structure to push this data into BI. Our version of BI is 7.0

Any help would be really appreciated

Vijay