How to Work with Threaded Text in Adobe Illustrator

Text can continue from one text frame to the next. This tutorial will explain how to link text frames.

Select the Type Tool [ ]. Drag out one text frame, then press Ctrl+Shift+A to Deselect All and create a second text frame. Here they are side by side.
Insert your text cursor in the first frame, then go to File > Place. In the dialog box, select any text file and check the Replace option. Then click Place and click OK on any Import Options that may open.
If there is more text than will fit, you'll see a red plus sign (+) at the lower right in the frame's Out Port.
Switch to the Selection Tool and go to View > Outline so that you can see both frames. Select the first frame and then click the Out Port. Go to the upper left edge of the second text frame and click when your cursor displays a link icon [ ].
Go back to View > Outline to return to the full-color artwork view.
Notice the line connecting the Out Port of the first frame to the In Port of the second frame. Experiment with making the first frame larger and smaller and watch how the text reflows.
You can thread as many text frames as you want between multiple artboards, if needed. The text threads view can be toggled on or off by going to View > Show/Hide Text Threads.