Combining 2 fill in form pdf's into one document

Question

I have created several fill in forms for my quality system in my business.
I open an empty form as a template, fill it in with data, then save it under a unique file name. For example, form1.pdf would be filled in and then saved as completedform1.pdf, then refilled in with different data and saved as completedform2.pdf.  Each form contains the same fields but different, unique, data.
I would like to take completedform1 and completedform2 and merge them together into one master file.  This file would be named, for example, as masterform1.pdf
When I insert completedform1.pdf into masterform.pdf, everything works fine.  However, the problem occurs when I insert completedform2.pdf.  As soon as the second form inserts, all of the data in the fields of completedform2 switches to match that of completedform1.  I believe this is because the fields have the same names (obviously) and so Adobe thinks the data should match.  However, I do not want it to change, each form (once filled out) becomes it;s own unique document.  I would have thought doing a save as and giving it a unique name would take care of this, but apparently not.
What do I have to do to "cement" the data on each form so that I can combine them yet maintain their individual data integrity?

Answer 1

The 'flattening' `graffiti is refering to is the Acrobat JavaScirpt action and not the prepress flatten. This JavaScript method was added with version 7 of Acrobat and it will not work with any version of Reader.
Converts all annotations in a page range to page contents. If a page range is not specified, all annotations in the document are converted.Note: 
Great care must be used when using this method. All annotations—including form fields, comments, and links—on the specified range of pages are flattened. They may have appearances, but they will no longer be annotations.
You can download a 'Flatten Pages' automation tool from Free Acrobat Automation Tools. You will have to read the included text file and JS file to learn about installing this code..
You can add the following code to the downloaded code to add a new menu item under the 'Document' option:
//</JSCodeSnippet>
//<JSCodeSnippet name="AddMenuItem">
// add menu item to docuemnt option gtk
try{ app.addMenuItem({ cName: '*Flatten Pages',
cUser: 'FlattenPages',
cParent: 'Document',
cExec: 'PDFScript_DoFlatten()',
cEnable: 'event.rc = (event.target != null);',
cMarked: 'event.rc = false'});
//</JSCodeSnippet>
} catch(e) {}
//</JSCodeSnippet>