Seems like you have a multi value combo there because in a regular combo you can't "check" list items, nor can you select multiple list items. I cannot say if that is the problem but I suspect it is. The list items you see are actually in records (rows) in a hidden table so I would expect the import to fail. I would not use multi value field as a rule so I can't say for sure. Perhaps review
The evils of lookup fields - http://access.mvps.org/access/lookupfields.htm
About Multi Value Fields - https://www.isladogs.co.uk/multivalu...lds/index.html
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.