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(RESOLVED) Appropriate method to ungrib surface and pressure level data from same product

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Suppose I have two different files for ERA-Interim, one for pressure level data and one for surface level data, both of which are needed to initialize WRF (e.g.!access)

What is the appropriate way to ungrib and metgrid these data? Do I ungrib one file type at a time, and then combine in the metgrid step? Or can I ungrib both file types at the same time given that they share the same Vtable?

Take a look at these instructions in our Users' Guide:

They describe the method for using 2 different data sources, but this also applies to using the same data source, with 2 different types of data contained in each. Hopefully this helps!