Mapping merchant field on employee imported credit card transactions

We have employees that use personal credit cards for their travel expenses (not commercial cards) and we want them to import their transactions via CSV and then create their expense reports. Then we will reimburse them. I've been testing the process and everything works great, except I cannot map the Merchant field from my csv import file to the credit card charge Merchant field. Netsuite doesn't give me access to that field. How can I setup a mapping that would include the merchant for each credit card transaction?

I have a case with support but their answer was to import as corporate card charges, which isn't what we want. I've attached a screenshot of the field mappings that do not include any way to specify the merchant in netsuite. Thank you all!