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
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Computer Graphics - CAD Specialist - Internet Information Design

Cambridge United Kingdom