In other words, I think I want to crop the left-hand picture's right border to the shape of the curve and the right-hand picture's left edge to the shape of the same curve, and then abutt the two newly cropped edges.

This sounds like it should be easy but the ways of PaintShop are still mysterious to me!

To make them appear to be separate images with a curved side, you can use layers to build your image. Start with a new file that is the size of both images put together.
For example, the two images are 200px wide each. Your new image should probably start with a width of 400. You can adjust the width later actually for the curve. The height of the new image should be what ever the taller jpg is. It would work best if the images you start with are the same height.

Open your two jpg images. Copy one, and paste it into the new image as a new layer.

Do the same with the second image.

Make a new vector layer. Draw your curved line as a guideline.

Switch layers to the first image you pasted in, leaving the curved line as a guidline. You might need to use the 'mover' tool first and align that layer to the left. Use the eraser tool, and erase all the pixels that extend beyond the curve.

Do the same with the second image layer you pasted in. Move it right. and erase all the pixels that extend beyond.

When you are done, hide the curved line, and the images should line up. You may need to do a little clean up work. When you are satisfied with how the two images fit together you can delete the curve layer, and merge the rest.

To make them two images again if you want, just select half, copy it and paste as a new image. Invert the selection of the image you were working in, to select the other half. copy it and paste it as a new image.

Place the images in a table, no cell padding or spacing, and align the cells left and right so the the images butt right next to each other in the table.

This should now give the appearance of two images with a curved side that are right next to each other. The left image will contain a part of the right image on the top, and the right image will contain part of the left image on the bottom - the curved part. But as I said, images are always rectangular, you just have to do a little visual magic.

Hope this helps. There might be easier ways to do this, but it is where I would start at least.

Nancy

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It worked great! When I get it all done I will send you a peek!