invoiceninja/app/Import/Transformer/Wave/ExpenseTransformer.php

<?php
/**
 * client Ninja (https://clientninja.com).
 *
 * @link https://github.com/clientninja/clientninja source repository
 *
 * @copyright Copyright (c) 2021. client Ninja LLC (https://clientninja.com)
 *
 * @license https://www.elastic.co/licensing/elastic-license
 */

namespace App\Import\Transformer\Wave;

use App\Import\ImportException;
use App\Import\Transformer\BaseTransformer;


/**
 * Class ExpenseTransformer.
 */
class ExpenseTransformer extends BaseTransformer {
	/**
	 * @param $line_items_data
	 *
	 * @return bool|array
	 */
	public function transform( $line_items_data ) 
	{

		$data = $line_items_data[0];

		$amount = 0;
		$total_tax = 0;
		$tax_rate = 0;


			foreach ( $line_items_data as $record ) 
			{

				$amount += floatval($record['Amount (One column)']);
				$total_tax += floatval($record['Sales Tax Amount']);

			}

		

		$tax_rate = round(($total_tax/$amount)*100,3);

		$transformed = [
			'company_id'  => $this->company->id,
			'vendor_id'   => $this->getVendorIdOrCreate($this->getString($data, 'Vendor')),
			'number' 	  => $this->getString($data, 'Bill Number'),
			'public_notes'=> $this->getString($data, 'Notes / Memo'),
			'date'        => date( 'Y-m-d', strtotime( $data['Transaction Date Added'] ) ) ?: now()->format('Y-m-d'), //27-01-2022
			'currency_id' => $this->company->settings->currency_id,
			'category_id' => $this->getOrCreateExpenseCategry($data['Account Name']),
			'amount'	  => $amount,
			'tax_name1'   => $data['Sales Tax Name'],
			'tax_rate1'	  => $tax_rate,
		];

		return $transformed;
	}
}