[Koha] How could i change an Item type

[Dagne Woldie, MS/HS Library Assistant]

Hello all currently we are using koha 3.8.4. i know this version of koha has Batch item modification, this help us to change only on 952y, but my interest is to change the biblo item type i.e 942$c, 

could you pls 

Thank you 
Dagne W.