Change the resource/asset-type of an asset

Hi,

I'm looking for an import of many switches and router and create the asset types "switch" and "router" for it. That will be no problem with an excel sheet and the connector solution.

But I already have switches- and router-assets in my altiris system listed as resource type "network device" and want them listed as "switch" / "router".

How can I do this? I found no way to change the resource type / asset type of an asset.

Would be glad for help
Linne