Excel Dynamic Graph Series

I have an Excel Workbook with numerous graphs. An example of a graph series is below:
=SERIES("Gross Revenue with Fed Taxes",'2 Yr Rev with Taxes'!$C$67:$Z$67,'2 Yr Rev with Taxes'!$C$78:$O$78,1)

the $C$78:$O$78 above is the range for the graph where $O$78  is the end of the graph line for January and will need to be changed to $P$78 for February , and so on. I have been making this change manually and would greatly appreciate a way to have the reference automatically change based on a month number that is entered on a control sheet. Thanks in advance for any assistance.
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Ingeborg Hawighorst (Microsoft MVP / EE MVE)Connect With a Mentor Microsoft MVP ExcelCommented:

you will need to create range names for each data series and plug them into the chart.

This is a bit of work to set up initially, but after that it will save a lot of time.

Whenever I have several series in a dynamic chart, and the source data is in several rows, but the same columns, I define one range name as the base range name and the other range names based on that range, using Offset()

For example

chtSeriesA refers to =offset('2 Yr Rev with Taxes'!$C$78,0,0,1,ControlSheet!$A$1)
chtSeriesB refers to =offset(chtSeriesA,2,0)
chtSeriesC refers to =offset(chtSeriesA,5,0)

chtSeriesA defines a range in row 78. chtSeriesB is two rows below that, chtSeriesC is 5 rows below chtSeriesA.

There are several ways to define the dynamic ranges, but in order to create dynamic charts, you will need dynamic range names for each chart series.

cheers, teylyn
Ingeborg Hawighorst (Microsoft MVP / EE MVE)Microsoft MVP ExcelCommented:

Assuming your control sheet is called ControlSheet and the number for the number of months to display in the chart is in A1, create a range name called chtData, referencing the following formula:

=offset('2 Yr Rev with Taxes'!$C$78,0,0,1,ControlSheet!$A$1)

Then edit the chart series through the dialog box and enter this in the series values field

'2 Yr Rev with Taxes'!chtData

Alternatively, edit the chart series and change it to

=SERIES("Gross Revenue with Fed Taxes",'2 Yr Rev with Taxes'!$C$67:$Z$67,MyWorkbook.xls!chtData,1)

Change MyWorkbook.xls in the above to the name of your workbook.

For more information on dynamic charts, see the tutorials on Jon Peltier's site http://peltiertech.com/Excel/Charts/Dynamics.html

cheers, teylyn
Ingeborg Hawighorst (Microsoft MVP / EE MVE)Microsoft MVP ExcelCommented:
see attached for a working example.

cheers, teylyn
mark-labargeAuthor Commented:
Thank you very much this is very helpful. I don't think I gave you enough information. I have 4, regional workbooks. Each workbook has 10 worksheets with a graph and each graph has several data series with data coming from different rows. The columns are always the same, with a starting point at C and and an ending point that  changes each month. In my series above that only thing that changes is the Z but each workbook might hve 40 or 50 different series
mark-labargeAuthor Commented:
Thank you very much. This will be a tremendous amount of work, but worth it in the long run.
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