There's really no easy way as you are basically moving from a landscape 640x480 to a portrait 240x320 screen (1/4 the real estate and it is rotated 90 degrees)

I might suggest putting a 240x320 panel on the screen and send to background as a guide for where you are putting things once you resize them.

Once you are done resizing and dealing with the layout, only then should you change the project type to TSU9400.