https://www.wpar.net/create-membership-site-for-two-types-of-participants-with-specific-permissions/1-%d8%b5%d9%88%d8%b1%d8%a9-%d9%81%d9%8a-%d9%85%d9%82%d8%af%d9%85%d8%a9-%d8%a7%d9%84%d9%85%d9%82%d8%a7%d9%84/