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ETABS 8 load combinations

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In Etabs8, the the load combinations for ACI are based on ACI 1999. If you are doing a earthqauke static analysis using IBC 2000, you are required to use 1.0 E instead of 1.4 E. If you input the new ACI load combinations manually you will have nearly 20 load cases, many of the "wrong" case results will be highlighted in the program, wasting a lot of time.
Is there a way to overwrite the default ACI combinations.
Mark Francois