multifunction system apps website

I want to develop 1 multifunction system apps website for my business. It’s got some features like what I listed ( in the pdf got more details) - Dashboard friendly user interface. , Order system, got inventory tab, Got accounting system, system order can sync with ecommerce, This system also got agents system and its levelling, Got membership, Got some ledger like Google sheet like. Got planning tab that can use Gantt chart. This system got auto whatsapp for people who buy from system. Got CRM system .