You don't, at least not for income tax reporting purposes if the "multiple" Schedule C's are legitimate in the first place.
Line A instructions (emphasis added:
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Describe the business or professional activity that provided your principal source of income reported on line 1. If you owned more than one business, you must complete a separate Schedule C for each business. Give the general field or activity and the type of product or service. If your general field or activity is wholesale or retail trade, or services connected with production services (mining, construction, or manufacturing), also give the type of customer orclient. For example, “wholesale sale of hardware to retailers” or “appraisal of real estate for lending institutions.”
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The LLC is a completely disregarded entity for income tax purposes; it doesn't exist.
Tom Young