If my husband paying almost 500 a month for one child and he has another child by another female do they split the amount ?

Depending on whether he has children at home, the child support amount for the other child will be a lower percentage based on his income. The original child support will remain the same, so the $500 will not change (unless the mom asks for a modification. In that case the $500 could go up or down depending on your husband's income.)