Hi, @laurie29112.
Here in the Community space, we always ensure we can address every customer's concern.
However, applying for a 94X form for several companies under one CPA license is a complex process. Thus, reaching out to qualified support for assistance is the appropriate alternative to address this concern accurately. With that, I recommend contacting the Internal Revenue Service (IRS).
Furthermore, I'll add this article about e-filing tax forms for your clients: E-file payroll tax forms for your clients.
The Community space is available 24/7 for any employment management concerns. Keep safe!