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Here is a measure that models occupancy sensors by reducing the lighting power density of certain space types by the percentage allowed by ASHRAE 90.1-2010 Table 9.6.2 and Addendum cg Table G3.1(g).

If you intend for your modeling method to comply with Appendix G you can modify the lighting schedule, as long as "credible technical documentation of the modifications" is provided to the rating authority.