Clearing all assets in WHD database without losing configuration

After importing all my assets and setting up WMI with the 100 or so DHCP scopes , creating all staff and admin accounts I find that the d&&^%$ auto asset "feature" has 'automatically' used up thousands of asset numbers for everything from cables to software licenses.. So now I need to re-import all assets again fixing the asset number to be some weird alphanumeric value then re-setup all the WMI, Orion NPM, accounts all over again...   

Question is can I delete the assets without blowing it all away? 

Thanks