I am filling out my child support calculation. I receive my normal pay from a current job, and military retirement pay as well. My former spouse is trying to include the entire "Gross Pay" from my retirement account. She receives roughly half of this. I believe I should only include my "Gross Distribution" from my W2. My question is, which do I report, my total "Gross Pay," or my Gross Distribution" amount?

That answer will and can depend upon the rules of your local court and/or the rules of the state you are filing this in ( assuming you are in the US)

I would hope on child support and child custody filings you have hired an attorney to represent you, if not you need one before you answer or respond

I agree with Fr Chuck, and note that this is really a LEGAL question better posted in the LAW forum under Family Law,