A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
You could run the following macro.
Before you do so, make sure that there is at least one cell in the workbook that has the old number format, and at least one other cell that already has the new number format. Otherwise, the code will throw an error.
Change the number formats in the code to the ones you want to use!
Sub ReplaceFormatting()
Dim wsh As Worksheet
Application.ScreenUpdating = False
' Change as needed.
Application.FindFormat.NumberFormat = "#,##0.00"
Application.ReplaceFormat.NumberFormat = "0.00"
For Each wsh In Worksheets
wsh.Cells.Replace What:="", Replacement:="", LookAt:=xlPart, SearchFormat:=True, ReplaceFormat:=True
Next wsh
Application.ScreenUpdating = True
End Sub