Adding new Line Item Types

functions.php

<?php // don't add this line since it's already in your functions.php file

/**
 * Changing the line item labels/names and adding a new line item type.
 * 
 */
function add_new_line_item_types( $types = array() ) {
	$array_of_new_types = array( 
		'tasks' => __( 'Labour' ), // change label for tasks
		'product' => __( 'Equipment' ), // change labal for product
		'expenses' => __( 'Expenses' ), // add new type
		);
	
	$types = array_merge( $types, $array_of_new_types );
	return $types;
}
add_filter( 'si_line_item_types',  'add_new_line_item_types' );


/**
 * Example of changing the line item type options.
 * 
 */
function modify_type_options( $columns = array(), $type = 'expenses' )  {
	if ( 'expenses' === $type ) {
		// modify the columns array for the expenses type
	}
	return $columns;
}
add_filter( 'si_line_item_columns', 'modify_type_options', 10, 2 );

I used this code using code snippet, it added the extra line items like Expenses, Equipment, Labour are being shown only in the dropdown list but when I select these new line items to add, only default line items are getting added i.e. Tasks and Services. Newly added line items are not getting added.