When managing a subdomain, it’s important to consider whether to treat it as part of the main domain or as an independent entity for SEO purposes. Here are some considerations to help you decide:
Separate Sitemaps:
It’s advisable for a subdomain to have its own sitemap. This is because sitemaps help search engines understand the structure and content of your website. If a subdomain is focused on different topics or has a significantly different structure from the main domain, a separate sitemap ensures that its unique content is accurately represented.
Google Search Console (GSC) Properties:
Each subdomain should ideally have its own GSC property. Google treats subdomains as separate entities for indexing and ranking, so having distinct GSC accounts allows you to monitor and manage the subdomain’s specific search performance, indexing issues, and other metrics independently from the root domain. This separation provides more precise insights and control over the individual performance of each part of your website.

Ultimately, separating the sitemaps and GSC accounts allows for better tracking and more precise management of search performance, making it easier to diagnose and address any SEO challenges specific to the subdomain. Additionally, this approach aligns with Google’s treatment of subdomains as separate entities, helping to ensure that each part of your site gets the attention it needs in terms of SEO strategy and optimization.