Can I outsource just part of my accounting?

While we have familiarity with providing partial outsourced services, we find that these are our least successful projects. Our internal processes, communication, and technology are optimized to operate in a specific way. We find that having a mixed environment creates opportunities for miscommunication, accountability issues, and is harder to train. These challenges make it such that it is typically more economical to outsource the entirety of the accounting and finance function vs. partial.