After upgrading to iOS 17 Beta 1 and macOS Sonoma Beta 1 update, users can add links to other notes in the Notes app.
This is done as follows:
After opening the Notes app, iPhone users can tap the input box to bring up the formatting navigation bar, then swipe to select the “Add Link” button.
After tapping the “Add Link” button, a new floating window will appear, and under the “Link To” window, users can search for the name of another memo and then choose to insert it, or change it to a different name.
On macOS, adding a memo link is a little easier: place the cursor where you want to add the link, then hit Command+K or use Edit and Add Link in the menu bar to invoke a window similar to the one on the iPhone, and the next steps are basically the same.