You can publish landing pages in LeadSquared in multiple domains/sub-domains. Multiple domains are available only in Standard and Enterprise plans, and there may an additional fee associated with it.
Once you add a domain (lets say mydomain.com), then you can add multiple subdomains for hosting landing pages. Let us say you need to add sub.mydomain.com as a landing page domain. Before you do so, you need to create a CNAME record in your DNS server, where sub.mydomain.com will point to cloud.viewpage.co. Only after this DNS record is created, you will be able to add the landing page subdomain.
In a rare situation, you may also get an error that somebody else has chosen this subdomain. Please contact email@example.com immediately in such an event. We will be glad to assist you.