How to convert Livestock to meat in desktop version

Greetings everyone. I am a new user of Frappe Books desktop and I need some help regarding conversion of Livestock ( Goats male & female ) into Mutton, and ( Bulls & Heifers ) into Beef. I just posted purchases of livestock through purchase invoices from different Vendors. Now I need to know what should be my next steps after the purchases?
Thanking in anticipation.