You can sum the data from the first and last sheets with:
=SUM(Sheet1!D20,INDIRECT(MID(CELL("filename",B2),F IND("]",CELL("filename",B2))+1,256)&"!D20"))
but I haven't managed to sort out getting it to sum over the full range.

Someone else may be able to fathom out how to do that, but the thread at
http://preview.tinyurl.com/3am5kc implies that there may be difficulties.
--
David Biddulph

"Martin Harriss" wrote in message
...
David,

Thannk you for your information. I have read the spec of the INDIRECT()
function, and experimented, but can make no sense of it. Can you offer a
better example than the one in the Excel 2003 help system?

"David Biddulph" wrote:

I think you'll need the INDIRECT() function.
--
David Biddulph

"Martin Harriss" wrote in
message
...
I want to add the sum of cell D20 in all worksheets from the first up to
the
current. I have tried:

=SUM(Sheet1:MID(CELL("filename",B2),FIND("]",CELL("filename",B2))+1,256)!D20)

but I get an error.

Putting =MID(CELL("filename",B2),FIND("]",CELL("filename",B2))+1,256)
into
a
separate cell returns the current workspace name, but it doesn't work
in
the
formula.

Any of you experts have any ideas?

Martin Harriss
Cambridge UK
--
Computer Graphics - CAD Specialist - Internet Information Design

Cambridge United Kingdom