Hm. When typing
it says "no document found: MasterSpreadsheet".
Ok. If it's to
program, I can live without it.
Quote from the wiki
Assuming you named the master document "master" you can access an alias like this: master#Spreadsheet.Length
Based on that I assume that you have to
create an alias for the cell you want to
reference. For example, perhaps cell b6 may be given an alias of "widgetlength". I suggest you first experiment by doing exactly as the wiki says and then try various experiments to
see if other things work.
Also the above quote shows different code to
what you said you used. it should be nameoffilecontainingthespreadsheet#nameofspreadsheetwithinthefile.alisofcellwithinthatspreadsheet.
Name of file, note that you have to
open the file save it and reopen it so that it has the correct name according to
Name of spreadsheet, note that there are two things a "name" (made at creation and can not be edited) and "label" (what you see, can be edited and is usually initially the same as "name" at creation)
So it is possible that you may have to
use the spreadsheet name, although I would have thought label would also work, you would have to
try it and see.
Multi document support in general has been planned for a long time, and is expected to
come eventually along with Assembly, but multi document usage is not
a required work around for the lack of a native Assembly workbench in FreeCAD, there are other tricks that work fine in one file, the main reason for multi documents at this time is to
ease management of a complex models in two ways,
1) by making it less complex and less confusing for the human operator by creating components of a complex model in different files
2) by speeding up FreeCAD when a recompute of the complex model becomes annoyingly slow