how to turn multiple text boxes into multi-line boxes without redoing everything

There are problems with converting text fields to mult-line that do not need to be mult-line (font size set to auto could end up being too small, for example).  Here's how to do it with a height test.

Find a text field in your document with a maximum height that should not be a mult-line field.  Run the following script in the console (assuming the name of the field is "Text1"):

var rc=this.getField("Text1").rect; rc[1]-rc[3];

The script above will return the height in points.  If it has a large number of decimal places, simply round up to a whole number.  Assume it returns 18 (1/4 inch) for this example, run the following script in the console:

for(var i = 0; i< this.numFields; i++)
{
var fName = this.getNthFieldName(i);
var oFld=this.getField(fName);
if(oFld==null){continue}
if(oFld.type=="text")
{
var rc=oFld.rect;
var height=rc[1]-rc[3];
if(height>18)//Change 18 to the height you need.
{
oFld.multiline=true;
}
}
}

Ah, that's easily done. Run this code from the JS Console:

for (var i=0; i<this.numFields; i++) {
	var fname = this.getNthFieldName(i);
	var f = this.getField(fname);
	if (f==null) continue;
	if (f.type=="text") f.multiline = true;
}