Loading Resource Codes as Non–Significant
Under most circumstances, you must import the data into a non-significant structure so that you can indicate parent codes such as Labor and Material.
Do not select the Load resource codes as non-significant checkbox on the Options page of the Integration Wizard if you use periods in your resource codes to identify parent information.
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Import Data From Scheduling Tools and Files
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Data Import Using Scheduling Tools and Files
Integration Wizard-Scheduling Tools and Files