Hello again, @rsalinas.
As mentioned by my colleagues @Anna S and @KlentB, QuickBooks Desktop is unable to know if you've halved a piece manually and have no option to automatically adjust measurement. Thus, your client may need to adjust manually the inventory on hand to reflect what you need or may enter the items already processed.
You can consider checking these articles which you may find helpful:
Stop by to the Community again if you have further questions, I'm always happy to help. Have a great day ahead.
