Which two invoicing preferences will produce a combined invoice for consulting services?

The invoicing preference that contributes to producing a combined invoice for consulting services is the choice that enables the aggregation of employee time on invoices. When "Combine Employee Time on Invoices" is selected, it consolidates the time entries from various employees into a single invoice, streamlining the billing process and providing clarity for the client.

By gathering all billable hours from different employees into one invoice, this option simplifies invoicing for consulting services. It allows clients to see the total hours worked across various consultants without receiving multiple invoices, which can lead to confusion and difficulty in tracking expenses. This combined approach is particularly advantageous for projects that involve several employees contributing to a client's needs, providing a more coherent and professional presentation of charges.

The mechanism of grouping and combining invoicing reduces administrative overhead and enhances customer satisfaction through clarity and simplicity in billing. This approach aligns well with best practices in financial management, where consolidating related costs can facilitate better cash flow management and client relations.