I would like my husbends child support to be deducted from my pacheck. Is this possible?

Most likely no, since you do not owe it. And I guess I would ask why,
Why is it not coming from his check ? Or you just write the court a check each week?

Lets make this clear, you are married to a man who has children from another woman and his owes child support for those children. And you would like that the support payments be automatically deducted from your paycheck. Is that correct?

I doubt if that can happen and wonder why you would want it to.

One possibility is for you to set up an automatic transfer through your bank. So you use Direct Deposit to put your pay in your bank and the bank automatically deducts an amount an transfers it to the custodial parent. That is doable.