Dandelion Cake,
This isn’t possible in the manner you are requesting, however you might try truncating or shortening the title with the “Part 1” at the end of it. Something like this:
<?php if (strlen(the_title('','',FALSE)) > 25) {
$title_short = substr(the_title('','',FALSE), 0, 25);
preg_match('/^(.*)\s/s', $title_short, $matches);
if ($matches[1]) $title_short = $matches[1];
$title_short = $title_short.' ...';
} else {
$title_short = the_title('','',FALSE); } ?>
<h2><?php echo $title_short ?></h2>
The above will shorten the title length to 25 characters and end it with “. . .”
The only other option is to create a category titled “Part 1:”, add the post into this category and finally call on that category title only to appear when on the Post page or when it is needed like this:
<h2><?php echo get_the_category_by_id(5); ?> <php the_title(); ?></h2>
In the above instance category 5 is titled “Part 1:”