I'm not exactly clear what you're asking.
But, if you delete marker number 2, then the current number 3 will become number 2, the current number 4 will become number 3, etc.
Is that what you're looking for.
I would like to keep all 10 scene markers, just group them differently on the various menus.
e.g., #1 and #2 on the first menu; #3, #4, #5 on the second menu, etc.
The default puts 3 scene markers together and won't let me move/drag/cut one scene marker from the first menu and move it to the second.
You're talking about editing the menu pages themselves?
That can get a bit complicated. The templates are pre-created with a given number of scenes on each page. Changing how many scenes appear on a scene page means actually editing the template itself, using a program like Photoshop or Photoshop Elements. I show you how to do this, step by step, in my "Muvipix.com Guide to Photoshop Elements & Premiere Elements", available on Amazon. But I wouldn't recommend doing it unless you're comfortable editing high-level, multi-layer Photoshop docs.
As an easier alternative, you can output your finished video as a DVD-ready MPEG from Premiere Elements and then creating your menus and authoring your DVD with a third-party program, like Sony's DVD Architect Studio (a $39 download). Third-party disc authoring programs offer a lot more flexibility in the design and layout of your disc menus, and they're definitely the way to go if you don't like using Premiere Elements basic templates. (And it's certainly no crime to use more than one program to make your movies!)
Principle restated as preface for my suggestion
The scenes on the Scene Selection Page of a menu trace back to the Timeline scene markers and where you placed them in the Timeline content.
Each scene menu is designed by Adobe for a specific number of scenes per page. And, those scenes in the menu fill up according to the sequence of the Timeline scene markers. When the number of Timeline scene markers exceeds the scene menu's scene per page, additional pages are generated to continue the sequencing. All that being said, without editing the .psd file of the scene menu, you are not going to stop that process.
The following shows you how to decrease scene menu buttons per scene selection page
The following shows you how to add scene menu buttons per scene selection page
Any questions or need clarification on the above, please do not hesitate to ask.