First, take a backup of your webalizer's output directory (/var/www/usage in my case) and its "state" directory (/var/lib/webalizer in my case). Do not skip this step; if you break something, you're going to want an old baseline to be able to get back to.
Next, read through the webalizer(1) manpages. At a quick glance, a couple items stand out in speaking to your question:
Quote:
A history file is searched for in the current directory (out-
put directory) and read if found. This file keeps totals for
previous months, which is used in the main index.html HTML
document. Note: The file location can now be specified with
the HistoryName configuration option.
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and, a warning FWIW:
Quote:
Some special precautions need to be taken when using the incremental
run capability of The Webalizer. Configuration options should not be
changed between runs, as that could cause corruption of the internal
data stored.
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It seems like you could edit the history file to include only the totals you want. I'm not sure what webalizer would do with that -- he may delete old html/image files after seeing the updated history file, or you may have to do it yourself.
This will require some research and tinkering, so if you don't have the patience for that it is probably better to leave it alone. (Me, I'm a tinkerer.)