Composite Common Criteria evaluations -- those that have a dependency on another CC evaluation, i.e., SQL Server and Windows Server -- can proceed in parallel. It is my understanding from the 8th ICCC that the other component/platform evaluation needn't be completed before the other can proceed. They do have to be "in evaluation" at least. If you are interested in doing a composite CC evaluation, this would be good to verify with your Common Criteria Test Lab (CCTL) and CC scheme in the country of evaluation.