Hi,
Imported goods for use by your business should show in the VAT return in box 7 as they are a business purchase. The following guidance shows what should be included in each box of the VAT return:
How to fill in each box on your return
This would not be coded as VAT exempt as you have advised the goods were liable to import VAT. We would advise that you speak to your software provider about the best way to record the imports in their software package as you may be able to add the entry as a single purchase rather than separating the purchase of the goods and the import charges.
Thank you.