Rounded Rectangle With Other Layers as the actual rectangle

[Surfer513]

This is hard to word this question, but I can't seem to find any info on how to do this. I have 4 layers (background, layer1, layer2, layer3-text). They fill all 300 x 600 pixels that comprise the .psd/future image. What I want to do is use a rounded rectangle to encompass all of the other layers, so that the surrounding pixels (around the rounded rectangle) are transparent.

I want all of my current layers to be the content of a rounded rectangle. How can I do this?? Thanks in advance!

 

[hawkeye]

If I follow what you're asking...place a vector mask using the rounded rectangle shape on the bottom layer and clip the layers above to the mask layer.