Hi Mike,
As Jason has mentioned, a script is the only way to perform this. If you are wanting to update the "Device Location" in OneClick Information Tab, Asset Information then the attribute would be Location
From CLI the actions would be
> ./update mh=0x200006b attr=0x23000d,val="Barcelona Computer Room"
Id Name Iid Value
0x23000d Location Barcelona Computer Room
For model handle 0x200006b the attribute 0x23000d (for Location which shows up as Device Location in OneClick) and the value would be "Barcelona Computer Room" as an example.
I hope this helps.
Best regards,
Glenn