Memberships can used to segment members within your society and clubs. Some societies have different tiers of paid memberships with different perks and prices.
To create memberships, login to your society's account, click on Club Memberships, and then click on Create A New Membership. Set the membership title, price and validity (if it's a limited time membership).
You may like to specify additional questions that you wish to collect from your members when they apply for a membership by clicking on the Add New Question button.