Sometimes layer effects get in the way. Especially in documents with multiple parts that wrap around (book cover, CD packaging, etc.) you may need a layer effect to stop on one side. But Photoshop applies a layer effect to all sides of a shape. What you need to to do is apply a layer mask, but only to the layer effect. Here's how to separate a layer effect from its layer:
- Open your file in Photoshop. Select the layer with the layer effects you wish to separate.
- Right click on the drop down Layer Effects menu. Select Create Layer (almost all the way at the bottom).
- If necessary, load a selection of your original layer and add a layer mask to the newly created effect layer to hide the fill area of your original layer. Load other selections or paint on the mask to hide any unwanted effect.
Note: This particular example that I created could have also been solved with some layer reordering but there are many cases where layer reordering won't solve the problem and this technique is required.