gppa-lmt-extract-first-letter.php

<?php
/**
 * Gravity Perks // Populate Anything // LMT Extract First Letter
 * https://gravitywiz.com/documentation/gravity-forms-populate-anything/
 *
 * Extract the first letter of a string using a Live Merge Tag
 */
// Update "123" to your form ID; and "4" to the field ID you are copying from.
add_filter( 'gppa_live_merge_tag_value_123_4', function( $value ) {
	return substr( $value, 0, 1 );
} );