Jerry,
A workbook is a single Excel file, containing a number of worksheets.
The number of worksheets you can have in a workbook is "limited by
system memory" (a quote from Microsoft), so there's no definite answer
to that one.
You could bring all of your invoices together into a single file, by
opening and naming a new file (say "Invoices - XYZ Pty Ltd") then
opening each of your existing files (say 4 or 5 at a time). Once each
file was open, you could then copy each invoice (worksheet) to your new
workbook. In Excel, this would be Edit Menu, Move or Copy Sheet, check
the make a copy box, and select Invoices - XYZ Pty Ltd in the "To Book"
section, then click OK. Repeat for each of your 130 invoices and hope
you don't reach the point in "Invoices - XYZ Pty Ltd" where it's
"limited by system memory"
It could be done, but I don't suggest it. It would take some time, and
you'd still have your current problem of being unable to total from a
number of worksheets.
You're better off setting up all your data on one worksheet, and having
your invoices generated when required on a separate worksheet as
described in my last post. If your datasheet was set up properly, you
could also create a merge file in Word, and use this to print invoices.
With this set up, the number of invoices you could manage would be
limited only by the number of rows in Excel (65 536 - wouldn't that be
nice!)
If you like, send me a copy of the invoice master with some dummy data.
I'll add a worksheet before it to feed your invoice data in and send it
back. Have a look at the formulas and setup, and see what you think.
Alternately, have a go yourself and, if you can't get it to work, send
it through. More than happy to help.
Eddie
e-mail: (e-mail address removed)