Text Flow - InDesign
From Help Wiki
If you have more text than will fit in the the text box created you may need to flow the text into another text box.
- Text boxes that have more text than will display in the size allocated to the text box have a red plus sign in the lower right corner
- Click the red plus and notice that the cursor changes to the loaded text icon
- Click in a new location in your document to create an additional text box that flows the text from the orginal