You may want to setup default commodity information within your Shiptheory account to account for situations where you might have products that don't have all their commodity information filled out. This default commodity information acts as a fall-back in that scenario providing your customs documentation with values in those areas where your products lack commodity information.
To start, and take advantage of these default fields, you'll want to make sure you have the below Auto-fill Product Data option enabled. This option, and the rest of the functionality mentioned in this article can be found on this page here.
Each of the above default options will be used in place of any missing commodity information on your customs documentation, meaning you'll always have something filled in on your documents product information.
Merging Product Rows
After filling in the above, you may want to entirely forgo individual customs information on your products combining the contents of your shipment into one product row for customs purposes and using your default commodity information to fill in for this new merged product row.
As you can see below, there are a couple examples of how multiple different line items end up, outside of using the default commodity information, we'll combine the following;
Note: Due to how we'll need to provide an individual unit value for these merged goods on the customs doc, the total value and weight will always be accurate to your shipments, however the individual unit value and weight may have a slight discrepancy, albeit a small one which is likely to be pennies or grams in the worst scenario.