In the advanced mode, you can cut out which specific area of a part you want to texture and also which specific area of the image you want to use. First, choose an image in the texture field in the tabsheet. Then begin with defining the textured area. You can do this with a few clicks on the part. Then define the texturing area in the picture. For each click, blue dots on the part and in the grid will appear. By dragging these dots you can define this area more precisely. With a right click on the dots you can delete or reset the points.
This mode works similar to the projector mode, with one difference: The advanced mode wraps the image also in undercuts; the projector doesn’t.

Left: Define the area on the model that should be labeled. Middle: Then define the according area in the picture. Right: Preview of the labeling.

Part textured in the project mode.

In the advanced mode, also the undercuts are textured.