Click the "Insert" tab and then click the "Text Box" button in the ribbon's Text group. The cursor changes to a "T." Drag the Text Box Tool next to the Gantt chart to create a text box.

How to Insert a Combo Box in Excel 2010. Combo boxes are a useful way of entering data into an Excel spreadsheet, combining the flexibility of a text field with the convenience of a list box ...

Yes, it is possible to link the contents of a text box in Excel to data in a cell.