Layers Question

[junior_ab]

The picture below has 2 parts to it. The images in the foreground (3d objects and the title) and the background (image holder)
The foreground pictures have a white background but the white background is eliminated by giving the layer of that image a multiply blending mode. But the problem i'm having is that when i merge the foreground layers the blending mode changes to normal. Any other way to merge each layer with its own blending mode?

[junior_ab]

Image

[RUSHVision]

One way to do it would be to:

1) Hit Ctrl+A to select everything

2) Hit Ctrl+Shift+C to copy everything

3) Hit Ctrl+V to paste the result into a new layer

3a) You can optionally hit Ctrl+N and Enter before doing step three and this will end up pasting into a new document