LinkedCell Property [Excel 2003 VBA Language Reference]
Returns or sets the worksheet range linked to the control's value. If you place a value in the cell, the control takes this value. Likewise, if you change the value of the control, that value is also placed in the cell. Read/write String.
You cannot use this property with multiselect list boxes.
This example adds a check box to worksheet one and links the check box value to cell A1.
With Worksheets(1) Set cb = .Shapes.AddFormControl(xlCheckBox, 10, 10, 100, 10) cb.ControlFormat.LinkedCell = "A1" End With