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Under LA Revised Statutes 9:315, they do indeed have a definition of "adjusted gross income" which is used for calculation of support that states:
"Adjusted gross income" means gross income, minus amounts for preexisting child support or spousal support obligations paid to another who is not a party to the proceedings, or on behalf of a child who is not the subject of the action of the court.
Thus, to answer your question this means the court is to consider any other preexisting support OR any support paid on behalf of a child who is not subject to an action of the court. Thus, you would need to file a motion to modify support and you would have to provide proof to the court of exactly what you pay in support for other children to have your adjusted gross income recalculated for purposes of the child support calculations.
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