Split Stack grayed out

I have a group of pictures that I imported from a span of a few days that I'd like to split up. When I select the picture that I want to use to separate the group, and go to the Stacks menu, "Split Stack" is grayed out. I'm certain there something very basic here that I'm not doing correctly, but I'd appreciate any help available. Thanks.

You don't ever mention how these images got stacked in the first place. If they aren't stacked you can't of course unstack them.

If they are stacked there should be a number in the upper left corner of the first image in the stack. Is that there? If you select the image are any of the stack commands not grayed out?

Ok different. Select the images you want in the new project then go to File->New->Project.

The popup will allow you to name the project and there is a checkbox that if selected will move the selected images into the new project.

See my last reply.

Good luck, take your time Aperture can be a lot to digest al at once.

Thanks for the check