Reporting on GL account number to show income and expenditure

Hello,

Can anyone advise on the below

"How can we report at a general ledger number (Income & Expenditure GL's only) so that we can see the split of costs associated with project costs & Business As Usual costs (BAU).

If you can explain the concept aswell instead of just naming the report it would be helpful.

Regards,

Pradeep Palli.