Based on additional information obtained from the submitter, the ODC CLINs are cost-reimbursement. To answer the basic question— yes, G&A can be applied to ODCs if that is the contractor's standard accounting practice. That said, some contracting officers don't recognize the application of G&A to ODCs. Rather than go into detailed arguments for and against this approach in this space, I included a link to an article that should provide more insight into the issue.