Enabling Legacy BOM Editing

Some manufacturing customers want to use Advanced BOM, but do not want to copy Legacy BOMs. These customers can enable legacy BOM editing.

Go to Setup > Manufacturing > Manufacturing Preferences.
In the Product Definition section, check the Allow Editing of Legacy BOMs box,
Click I Agree.

After you click Agree, you cannot disable the Advanced BOM feature. It is important to test this feature in your sandbox account before enabling it in your production account.
Click Save.