1. Create a selection of polygons on the wine bottle where you want your label
2. ‘Set selection’ (in the selection menu) and give your selection a name eg ‘label’
3. create a new material, put your photoshop file in the color channel
4. Apply this new material to your bottle.
5. Click on the material in the object manager – this should bring up some options for the material including ‘selection’ (under ‘Tag’). Type the name of your polygon selection(eg label) in the selection box.