I have set up my CSV, but have run into 2 issues.

If a item does not have enough QTY On Hand the import errors out. I would like it to simply place the item on BackOrder. I can not know ahead of the importing process if there is QTY On Hand, so setting Shipped QTY to 0 on those items is not an option.

I need to change the tax status based on ship state but changing the number in the field for HDR-Customer Tax Status from 0 to 1 to 2 seems to have no effect on the header once it is imported.