There currently isn't a clean way in NetSuite, but there are various routes you can go. For us, whenever we buy office supplies for example and it was not taxed to us, we enter the supplies order total on the bill to our office supplies expense account. Then when we go to file and pay our use tax, we run a saved search for all bills entered with that office supplies expense account by location so we can see our total amounts to report. If it's an actual item that you sell to customers that you consume, you can adjust that item out of inventory and leave a memo that it's for internal consumption. Then when you go to file for use tax, pull all of your inventory adjustments that were made for internal consumption to get the totals.