DNS setup for redirected domain
A particular account I manage has one website on InMotion (let's call it myorg.com). There are also two other domains that redirect to it: myorg.org and myorg.net. I just discovered that the DNS for those two redirected domains is elsewhere (the former registrar before I transferred the registrations to NameCheap recently). I need to fix that.
I know I need to change my settings on NameCheap to point those two domains to InMotion's nameservers. But then what? I know how to do 301 redirects in .htaccess (or have cPanel do it for me), but I don't know the correct DNS records. Do I just make an A record for each one with the same IP address as myorg.com, or is there more to it? Or is there something automatic in cPanel to set that up? I noticed that cPanel offers something called Aliases, but I don't know what that actually does.