As a precondition, the content must have been created in GoodNotes. To copy / move it:
- Select the Lasso tool. Tap it again and make sure to enable the relevant options. For example, if you're going to select handwriting, check that the "Handwriting" option is enabled.
- Draw a loop around the content you want to copy/move.
- Tap on the selection and tap Cut or Copy.
- Long-press on the current page, or any page in any document, and tap Paste.