how to delete an asset type from assets?

how to delete an asset type from assets?

Hi
I'm interesting of ServiceDesk Plus and trying it.
Please, tell me, how i can to delete some asset types from assets? (see attachement Capture.jpg)
Can i delete native assets from there or only imported by me?
and one more question: ServiceDesk Plus supports importing from .csv file assets with Russian language? (see attachement cap2.jpg)
 
Thanks.

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