Format ALL checkboxes to link to adjacent cells w/o having to Format Control all individually?

try this code

Sub CreateCheckboxes()
    Dim cell As Range
    Dim chkBox As CheckBox
    Dim ws As Worksheet
    
    Set ws = ActiveSheet
    
    For Each cell In Selection
        ' Calculate the position of the checkbox
        Dim leftPosition As Double
        Dim topPosition As Double
        Dim chkWidth As Double
        Dim chkHeight As Double
        
        
        chkWidth = 15
        chkHeight = cell.Height / 2
        leftPosition = cell.Left + cell.Width / 2 - chkWidth / 2
        topPosition = cell.Top + (cell.Height / 2) - (chkHeight / 2)
        
        ' Add checkbox and set its properties
        Set chkBox = ws.CheckBoxes.Add(leftPosition, topPosition, chkWidth, chkHeight)

        With chkBox
            .Caption = ""
            .Value = xlOff
            .LinkedCell = cell.Offset(0, 0).Address
            .Display3DShading = False
        End With
    ' Hide the value in the linked cell
    cell.Offset(0, 0).Value = "False"
    cell.Offset(0, 0).NumberFormat = ";;;"
    Next cell
End Sub

you can see the result, the cells you select is added with checkboxes, and the checkboxes is linked to each of the  cells, and the value(it should be "true" or "false") of the cells is hide. 

the result

linked to the original cells, and the value of cells is hide

 

_hgr_excelhelp 

_hgr_excelhelp 

You ask how to automate the creation of checkboxes and linking cells to these checkboxes. The topic below includes a macro i created. It creates checkboxes (how many do you want?), names them and links each of them to a cell. Perhaps this gets you started. You need to scroll down a bit, though.

https://techcommunity.microsoft.com/t5/excel/copying-a-check-box-to-other-cells/m-p/1091496