If your husband has 100% exempt income, you should be completing your W-4 without a 2nd income for Step 2. To get as close to your previous situation as is now allowed, Step 3 on Form W-4 allows you to calculate the change to your withholding based on the expected credits you may receive.
Here's a link to the new format you can fill out and turn in to your employer Form W-4. Pay close attention to line 3 and you should be on your way!
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