WP User Manager - Conditional user role at registration based on a custom field

wpum_conditional_role_based_on_field.php

<?php

add_action( 'wpum_after_registration', 'wpum_conditional_role', 20, 2 );

function wpum_conditional_role( $user_id, $values ) {
	$field_key = 'wpum_field_14'; // Change this to your field key

	if ( ! isset( $values['register'][ $field_key ] ) ) {
		return;
	}

	$value = $values['register'][ $field_key ];

	if ( $value == 'food' ) { // Change logic to be what you need based on value
		$user = new WP_User( $user_id );
		$user->set_role( 'editor' ); // Change role
	}
}

Save this file to your /wp-content/mu-plugins/ directory (you might need to create the mu-plugins directory).