As I understand the OH requirements -- it is a duplicate of the Federal medical deductions i.e. total unreimbursed medical / out-of-pocket expenses less 7.5% of AGI. Therefore I do not understand the allocation between spouses question. Are you filing as MFS for Federal and doing MFJ for OH or the other way around ?
Any allocation of the eligible expenses is done you ( i.e. you enter the data). TurboTax has no way of knowing how it should be done.
Am I missing your question ?
