I can understand how helpful it would be for the different tabs in your excel sheet to be recognized. However at this time this is not a feature that is currently available. I apologize for any inconvenience this may cause! In the meantime, I have tracked this feedback in your account. As a workaround I would suggest saving these tabs as separate sheets, or even copying and pasting these contacts into your account.
Frankie P. Community & Social Media Support
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