Alright, I've gone through the process and now know how to do this with DVDDecrypter and VideoRedo TV Suite. Doesn't help you yet I know.
Ok, first off, we're going to use DVDDecrypter to rip individual chapters from your dvds. You need to rip from a disc, or from a mounted ISO file. I don't know which you have. You can mount ISO files in a free program called VirtualClone Drive from Slysoft.
Using DVDDecrypter in IFO mode, you open the dvd and on the right side, you'll see a list of chapters. Right click on one of the chapters and select Invert Selection. This will take all the check marks off the chapters. Now go through and get the one chapter that you want from this disc in this first operation (place a check mark in the box next to this one chapter). Rip it to the hard drive, and you'll see that it comes in the form of a small dvd video.
Do this for each and every one of the chapters that you want.
Next up to bat, VideoReDo TV Suite. Start the program and click on Open Video. Navigate to the first chapter that you want in your new compilation. Let it open the video, then click on Joiner at the top of the main window. Add this first video to the list. Now, without closing VideoReDo, click on File, then Open Video. Open the second video, and add it to the Joiner list. Do this for every one of them.
When you have all of them in the Joiner list, click on Create Video from Joiner List. This will produce an mpeg file from your chapters.
Now, go into Tools-->Options within VideoReDo. Go to Chapter Marks. Put a check mark in the box for Chapters at Scene Markers. Click OK.
Next step is to open the mpeg file you made from your chapters. At this point you're going to have to do some work on the time line. At the very first point of the time line you'll see a little sliding cursor. You can move this along the time line to find various parts of the video. While the cursor is still on the first part of this time line, hit A on your keyboard. You'll notice that a little red triangle appears on that part of the timeline. This is a scene marker.
Move the cursor to the start of the second chapter within this mpeg file. Hit A again to leave a scene marker here. Do this for every one of the chapters. You have lots of navigation tools in this editor to fine tune the placement of the markers.
Once that is set, click on Create DVD down at the bottom right of the window. You may want to change the output location of the dvd, and you most definitely will want to change the text of the menu. Once you have everything set, hit Author.
You will now have a dvd with one title, but it will also have chapter points that you can navigate to with any stand alone dvd player or computer software player.
The other way to do this is to make separate titles for each chapter. You wouldn't have to join them all together to do this. They would play in sequence and you could select each from within the menu, but you wouldn't have chapter marks within each title unless you do some manual scene markers within each title, or set the program to make chapters for a certain period of time duration.