I have one server with the main domain being: WebSiteA.com. I've got 2 others domains on the same server: WebSiteB.com and WebsiteC.com. I want to have one website architecture with 3 different sections, with 3 differents domains.So, when someone visits WebsiteA.com/mycategory I want them to see WebSiteB.com on this page and all the others in this category.So this : WebsiteA.com/mycategory/page1WebsiteA.com/mycategory/page2WebsiteA.com/mycategory/section/page3Becomes this :WebsiteB.com/page1WebsiteB.com/page2WebsiteB.com/section/page3Problem 1: I first tried to change the DNS in the WebsiteB.com domain to point to WebsiteA.com. It works, but for the entire site. (I suppose I should use alias instead to limit to one section?)Problem 2: I have an SSL setup on WebsiteA.com, but when I'm trying to reach the page with WebsiteB.com, I receive an error.So I suppose I should use a Multi-Domain (UCC) SSL certificate? 
Multi-Domain SSL and redirections
redirects;security certificate;multiple domains