I would like to create automatically a checkbox per row but also if
the checkbox is selected I want to hide columns J to K, I got this
code but I don't know how to change it to put the condition about
hiding the columns.
could anybody help me...

this is the code :

Sub add_checkbox()
On Error Resume Next
Dim c As Range, myRange As Range
Set myRange = Selection
For Each c In myRange.Cells
ActiveSheet.CheckBoxes.Add(c.Left, c.Top, c.Width,
c.Height).Select
With Selection
.LinkedCell = c.Address
.Characters.Text = ""
.Name = c.Address
End With

c.Select
With Selection
.FormatConditions.Delete
.FormatConditions.Add Type:=xlExpression,
Formula1:="=" & c.Address & "=TRUE"
.FormatConditions(1).Font.ColorIndex = 6 'change
for other color when ticked
.FormatConditions(1).Interior.ColorIndex = 6
'change for other color when ticked
.Font.ColorIndex = 2 'cell background color =
White
'I think here should be the hiding option but i
don't know how to write it
End With


Next
myRange.Select

End Sub