You can lock a model to prevent it from being accidentally edited or moved when you sculpt in the 3D View.

You can sculpt through a locked model. For example, you might want to lock the eyeball on a character while you sculpt the eyelids to wrap around it, or sculpt the gums and mouth around a set of locked teeth, and so on.

1. In the Object List, select the model you want to lock.
2. Click the Lock icon to the left of the item name to lock it. Clicking the lock icon again unlocks the item.

   

   Items cannot be sculpted, edited, or moved when they are locked.