On Land

Environment Information
At Rill Architects we run ArchiCAD on Mac OS X. If you work at Rill, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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Our title block is an object with hard-coded dimensions for each sheet size on our printers. The template has a worksheet for each sheet size, and within each worksheet is placed a title block object set to that size. Then there's a saved view of each worksheet, and the view is placed in each master of a given size.

One object -> A few worksheet views -> Several masters -> Many layouts.

Graphical changes to a given sheet type are made in the master. Changes to all the sheets are made in the worksheet. Changes to every sheet in the office are made in the code of the object. (Rare.) To change every future sheet in the office while leaving extant work alone, you need a new object and you need to update the template(s).

The text information in the title block object is a mixture of autotext tags in <angle brackets> and hard-coded text in quotation marks. The TEXT2 shape commands can use hard-coded text or string variables. Both of these will display the text 'Bar':

!! Display the text in the string variable named foo
foo='Bar'
TEXT2 0, 0, foo

!! Display the literal text 'Bar'
TEXT2 0, 0, 'Bar'

(In this usage, double and single quotation marks (and grave accent marks, on the ~ key) are interchangeable as long as the pairs match.)

Within each script of the object, you need to do a Find (Cmd+F) for all the text bits that need to be changed. If the company name has changed from Foo Architects to Bar Architects, you need to find each instance of 'Foo' and replace it with 'Bar'. Optional: Use the Replace button to find and replace in one go. I usually don't use Replace All unless it's a very straightforward case with a lot of instances. Also note the checkboxes.)

Find & Replace

In the title block object, only the master script and 2D script need to be changed. But while I was in the neighborhood I added some years to the relevant values lists in the parameter script. (Values lists offer the user choices for a given parameter.) I did a Replace All of

'2010', 

with

'2010', '2011', '2012', 

taking care to remember that last comma.

Save as, not Save. Actually, you should save as before you make changes so you don't forget.

More: Structure of Objects, and the Object Editing Environment