If you are using the recovery rebate credit to get the first or second stimulus payments then the amount on line 30 is the stimulus money and will be a part of the total refund you are seeing on line 35a.
However----you mentioned being concerned about back child support. If you owe child support your refund can be seized for the child support, including the amount from line 30. Your 2020 refund is subject to being offset if you owe child support.
When those stimulus payments were sent out in 2020, the first one could be taken for child support. The second one could not be taken---IF it was sent by itself in late 2020 or early 2021 to you. But if you are getting it as a credit on your tax return, then the rule is different---it can all be used to pay child support if you owe that much.
TurboTax never knows if you owe child support or if the IRS is going to offset your refund. If the IRS takes your refund they will send you a letter after it happens.
Reduced Refund https://www.irs.gov/taxtopics/tc203
NOTE: You can contact the IRS Treasury Offset Program Call Center at 1-800-304-3107 to ask if they have an offset for you on file. TurboTax would not have that information.
Check 1040 line 30 for any amounts you didn't get during the year. It will be included in your refund or reduces a tax due. Did you get any of the 1st or 2nd stimulus payments? (don't worry about the new 3rd one yet, that comes separately). When you filled out your tax return you needed to enter the actual amounts you already got to see if you qualify for any more. But that has been the most common reason for the IRS to reduce your refund. People have been claiming the wrong amount on line 30 when they already got the stimulus checks.
I didn't understand the rest of your post.
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