Can Delete Opportunity Products Without Opportunity Delete Permission

Because permission for opportunity products depends on the parent object (opportunity), permissions for opportunity products are granted according to permissions for opportunities.
Therefore, it is not possible to grant individual permissions for opportunity products via profiles or permission sets.

The "Edit" and "Delete" permissions for opportunity products are linked to the "Edit" permission for opportunities.
To prevent the deletion of opportunity products, you must not assign "Edit" permission to the opportunity linked to the opportunity product.

Please note that it is not possible to individually disable the "Delete" permission for related opportunity products while retaining the "Edit" permission for opportunities.