When using Theme Blvd WordPress Framework, replace the category output in a post showcase with a custom field.

functions.php

<?php
/**
 * Add custom field after current <span class="item-title">
 */
function my_item_info( $output ) {
	
	$output .= sprintf( '<span class="tagline">%s.</span>', esc_html( get_post_meta( get_the_ID(), 'my_custom_field', true ) ) );
	
	return $output;
}
add_filter( 'themeblvd_item_info', 'my_item_info' );

/**
 * Replace taxo term with custom field in post showcase.
 */
function my_item_info() {

	$post_id = get_the_ID();

	$output  = '<span class="item-title">';

	$output .= sprintf( '<span class="title">%s</span>', esc_html( get_the_title( $post_id ) ) );

	$output .= sprintf( '<span class="cat tagline">%s</span>', esc_html( get_post_meta( $post_id, 'my_custom_field', true ) ) ); // Using class "cat" to inherit theme styling.

	$output .= '</span>';

	return $output;
}
add_filter( 'themeblvd_item_info', 'my_item_info' );

/**
 * Add custom field after taxo, within wrapping <span>.
 */
function my_item_info( $output ) {

	$field = sprintf( '<span class="cat tagline">%s</span>', esc_html( get_post_meta( get_the_ID(), 'my_custom_field', true ) ) ); // Using class "cat" to inherit theme styling.

	$pos = strrpos( $output, '</span>' ); // Find last occurrence of </span>

	if ( $pos !== false ) {

		$output = substr_replace( $output, $field, $pos, strlen('</span>') );

	}

	return $output;
}
add_filter( 'themeblvd_item_info', 'my_item_info' );

/**
 * Replace taxo term with custom field in post showcase, 
 * only if custom field exists.
 */
function my_item_info() {

	$post_id = get_the_ID();

	$post_type = get_post_type( $post_id );

	$output = '<span class="item-title">';

	$output .= sprintf( '<span class="title">%s</span>', esc_html( get_the_title( $post_id ) ) );

	if ( $value = get_post_meta( $post_id, 'my_custom_field', true ) ) {

		$output .= sprintf( '<span class="cat tagline">%s</span>', esc_html( $value ) ); // Using class "cat" to inherit theme styling.
	
	} else {

		if ( ! $tax ) {

			$tax = 'category';

			if ( $post_type == 'portfolio_item' ) {
				$tax = 'portfolio';
			}
		}

		$tax = apply_filters( 'themeblvd_item_info_tax', $tax, $post_type, $post_id );

		$terms_obj = get_the_terms( $post_id, $tax );

		if ( $terms_obj ) {

			$terms = array();

			foreach ( $terms_obj as $term ) {
				$terms[] = $term->name;
			}

			$output .= sprintf( '<span class="cat">%s</span>', esc_html( implode($terms, ', ') ) );

		}

	}

	$output .= '</span>';

	return $output;
}
add_filter( 'themeblvd_item_info', 'my_item_info' );