Ulysses has no fixed structure, you can write your works in any number of sheets or groups. On top of that, you can also glue, divide or merge your sheets. This is how it’s done.
Most of us will have run into this situation before: you’ve started to write your chapter in a sheet, but as it grows and grows, you decide to divide it into pieces, creating a new chapter.
You can simply right-click in the editor where you’d like to divide your sheet and select “Split Here…” from the context menu. This will automatically create two new sheets out of your old one, which will be glued together.
Glued sheets are shown in light-blue in the sheet list. When selecting one of them, all are shown in the editor. They will also be exported together. You can unglue your sheets too, just select the ones you’d like to unglue and right-click on your selection. Then choose “Unglue…” from the context menu and you’re done.
Please note that glued sheets are actually two separate sheets, they only behave as if they were one. That's why glueing is only available when the group's sorting is set to manual. If you sort the sheets of a group per title or date, glued sheets will arrange in order, so you can't see if they're glued.
You can merge sheets as well, first go to your sheet list and hold ⇧ (shift). Then select the sheets in question and right-click them. This will bring up the context menu, just choose “Merge…” and they will be joined together. This also works for sheets that haven’t been glued.
Splitting and merging also works fine on iOS, much in the same way as on Mac. In order to split a sheet, long-tap in the editor where you’d like to split it and select “Split Here”.
You can merge your sheets too, just go to the sheet list and tap “Select”. Then select the sheets you’d like to merge and choose “More… › Merge Sheets…”.
On iOS, glueing works pretty much the same as on Mac. Glued sheets are shown with a blue bar in the left of the sheet list, and they will be exported together. You can also unglue your sheet, just select them and select “Unglue” from the action popover.