Automatic consumption entry for machinery Related items

Hi,

We need the option for automatic consumption setup instead of manual entry. For machines repair purpose we receive the item using receipt as inventory item and deliver in raw material sub inventory. For example we received the items 10 nos and if we use the 5 items for machine repair purpose, then the 5 nos of items will consume automatically and balance 5 nos of items stored in sub inventory. If possible guide us how to setup the automatic consumption?

Thanks

Regards,

Sundar