I'm not sure I understand what you mean by a 'tick' mark, but I use 'check' marks a lot by entering an uppercase "P" and use the "Wingdings 2" font. Here's a little utility that I use. This utility requires that you click on the cell where you want the check mark, then execute the macro (which I do with a button):
Sub InsertCheckMark() ' 7/23/02
' Inserts a check mark into the selected cell
With ActiveCell
.Value = "P"
.VerticalAlignment = xlTop
.HorizontalAlignment = xlCenter
.Interior.ColorIndex = White
With .Font
.Name = "WingDings 2"
.ColorIndex = Black
.Size = 12
.Bold = False
End With
End With
End Sub
Try it . . . you'll like it!