Firstly, if the value of any single item or group of similar items is more than $5000, you can't take a deduction unless you have a signed appraisal and a form 8283 signed by the appraiser and a representative of the charity.
Then, you each need to list your deductions separately. There's no automatic way to split it. If you donated 10 shirts with $50, you each list 5 shirts for $25. You don't have to use ItsDeductible to get your values, you can make a custom listing in Turbotax such as "used household goods" and enter your own value for your half of the donation.
Also be aware that ItsDeductible values are national averages and are not guaranteed to be accepted by the IRS. If audited, you will want proof that the values are reasonable for your area, such as a price listing from local thrift and consignment stores.
And finally, be aware that you need a receipt from the charity. The IRS is cracking down on this in audits. A blank receipt or a generic receipt for "5 bags of household goods" is not proof of the inventory of what was in the bag, even if you have photos and a list. It is advised for large donations to take your written inventory and have it signed by someone from the charity.
