We make a product called .rpt Inspector(TM). The current released version 1.00 (released October 2002) supports doing this (and a lot more across the same report or a batch of reports).
So you can open that report, go to the formula you wish to use across all the other formulas. Copy the formula into the clipboard. Select the other formulas in one shot and paste the formula to all of them.
On our website is a set of animated quick guides, including one for doing exactly what you're looking for with formulas.
You can download the existing version for a 30 day free trial.
Or with the new version which is in beta, you can do a search and replace (including pattern matching).
Here's a little bit of what else the upcoming version does:
o data source / database conversion and migration (we can now do things like... batch set location, batch convert from ODBC to Native Oracle, batch convert from OLE DB to Native SQL Server, etc.)
o spell checker
o search and replace (search for all instances in as many reports as selected for "(c) Acme Corp" and replace with "(c) Whatever You Want" or for table names, formulas, etc...
o report "play" lists
o copy default parameter values from a master and propagate to selected
and a lot more....
We will be showing this latest version (and giving out free beta copies) at the 2003 conference for the Crystal Users Group of North America in Vancouver, Canada May 21-23, 2003.
You can also sign up to be part of this limited beta program.
Software Forces, LLC
makers of .rpt Inspector(TM)