1) Go to Settings > Website > Domains & URLs and add your new domains to Hubspot
2) Go to Settings > Website > Blog, select your Blog and change the domain information. You should select go.domainname.us as domain and use /news or /blog as Blog slug. This will automatically change your blogs domains and will create redirections.
If you are using Landing pages instead of Blog, it's a bit more complicated. In that case, you should do the previous step 1) and then manually change the domain in each page. There is a way to do it using the API also but it gets a bit more complicated.
1) Go to Settings > Website > Domains & URLs and add your new domains to Hubspot
2) Go to Settings > Website > Blog, select your Blog and change the domain information. You should select go.domainname.us as domain and use /news or /blog as Blog slug. This will automatically change your blogs domains and will create redirections.
If you are using Landing pages instead of Blog, it's a bit more complicated. In that case, you should do the previous step 1) and then manually change the domain in each page. There is a way to do it using the API also but it gets a bit more complicated.
Well, I believe you can still do the two steps I mentioned in my previous message.
By changing the domain of your blog from go.domainname.us/blog to domainname.us, all your content will be under the new URL (main domain).
The problem is if you already have content in domainname.us/blog and you want to add everything you have in go.domainname.us/blog as well, as this would mean combining two blogs.
In that case, you might be able to export/import articles from one Blog to another using the API, but it will be a quite challenging migration.