Maybe I have missed this in the documentation, Is there a way to add non inventoried devices to the inventory or asset list?

For instance, we have a bunch of VIDYO video codecs that we would like to have in our inventory in zcm, however they are not able to have an agent or inventory agent installed. Instead of having to keep track of this in a different database, can these be added manually?

If someone has the info or can point me in the direction in a manual or TID, that would be great.