[quote user="Barry Lothian"]I'm trying to update tag values but unsure where I should call redraw...[/quote]
You should not need to call Redraw at all. The versions of MicroStation that use DirectX graphics do redraws automatically.
[quote user="Barry Lothian"]I'm trying to update tag values but unsure where I should call rewrite...[/quote]
I suggest that you prototype your code in MicroStation VBA (i.e. lose Excel). If it works in MicroStation VBA, you may be able to persuade it to work in Excel VBA. If it doesn't work in MicroStation VBA, it definitely won't work in Excel VBA.