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The information in Form 1094-C Part III (ALE Member Information - Monthly) comes from the totals in the Affordable Care Act Compliance window (Tasks, ACA Compliance). See the example below:

You can find step by step setup instructions in Payroll Help; look for the topic called “ACA reporting."
For details on filing requirements and instructions, go to www.irs.gov to download IRS publications on Affordable Care Act (ACA).
What do I need to know about the Affordable Care Act (ACA)?
What Payroll information prints on Form 1095-C to Employees?
How do I set up ACA in Sage 300 Construction and Real Estate?