First, we'll need to update the Item Properties that are already set up in your database. For more information on how to do this, see https://support.orchestrated.com/hc/en-us/articles/115015790147-How-Do-I-Add-Update-Item-Properties.
Once the Item Properties names have been updated, you can then use the Planning Management Utility to add these properties to each item. We have a walkthrough video available (http://support.orchestrated.com/hc/en-us/articles/220211868-Planning-Management-Tool-Training-Video) as well as a walkthrough with step by step screenshots ((http://support.orchestrated.com/hc/en-us/articles/219622068-Planning-Management-Utility).
This utility will then allow you to add those Inventory Properties to the item(s) you designate and simply sync back to your database.