Hmmmm.... scratch the above. In my haste of crossing eyes at the spreadsheet, I failed to notice that the minimums are occasionally single digit with one decimal place values, so the above code is useless if the value ranges between 9.9 and -9.9 in value. So would this be applicable?
Option Explicit
Sub AddParenthesesWithSpace()
Dim rng As Range
Dim cell As Range
Dim strVal As String
' Set the range to B3:N27
Set rng = ThisWorkbook.Sheets("Sheet3").Range("B3:N27")
' Loop through each cell in the range
For Each cell In rng
' Get the string value from the cell
strVal = cell.Value
' Check if the string has at least 4 characters and Smaller than -10.0
If Len(strVal) >= 4 And Left(strVal) = "<=-10.0" Then
'Insert space and open parenthesis after the 5th Character
strVal = Left(strVal, 5) & " (" & Mid(strVal, 6)
' Add closing parenthesis at the end
strVal = strVal & ")"
' Update the cell value
cell.Value = strVal
Elseif
' Insert space and open parenthesis after the 4th character
strVal = Left(strVal, 4) & " (" & Mid(strVal, 5)
' Add closing parenthesis at the end
strVal = strVal & ")"
' Update the cell value
cell.Value = strVal
End If
Next cell
' Clean up
Set rng = Nothing
End Sub