Number Left to Fill based on Accepted Offers - Projection

Summary

Need a Projection to provide the Number Left to Fill based on Accepted Offers

Content

In OBI there is an object to provide the "# Openings Left To Fill (Accepted)".  We need to reproduce this same logic in TCC.  Is it possible to build this logic into a Complex projection?  We are using something for number of opening left to fill.

<quer:projection alias="NumberLeftToFill" xmlns:quer="http://www.taleo.com/ws/integration/query"&gt;
  <quer:subtract>
    <quer:field path="JobInformation,NumberToHire"/>
    <quer:query projectedClass="Application" alias="Hired">
      <quer:projections>
        <quer:projection>
          <quer:count>
            <quer:field path="Number"/>
          </quer:count>