Hi Jowashy.

Try:

'=========
Private Sub CheckBox1_Click()
With Me
.CheckBox2.Visible = _
.CheckBox1.Value = True
End With
End Sub
'<<=========


This is event code and should be pasted
into the worksheets's code module (not a
standard module and not the workbook's
ThisWorkbook module):

Right-click the worksheet's tab |
Select 'View Code' from the menu
Paste the code
Alt-F11 to return to Excel.


---
Regards.
Norman