Hey Eagleeyesolutions,
It may be best to reach out to an Tax Accountant, specializing in Quickbooks, just in-case there is something specific you need to do.
From the point of view of submitting a VAT Group return, Quickbooks is not programmed to support a VAT Group's return, which i expect is slightly different than the standard VAT return (perhaps not at user level, but in terms of HMRC forms, we know how they love their forms!) HMRC may be happy for you to use a bridging software, to combine each companies VAT returns into a single submission and submit through that method.
I'll leave this open to the wider community - however, i'll add one last recommendation to this post - speak to HMRC, and find out if each company needs to submit induvidual VAT returns through MTD, which HMRC then combine, or if there is a different process for your companies being a VAT group - Mention we have a bridging tool available for our customers, which you'll be able to use.
