It probably depends on the pool you are connecting to, but I don't think this matters in general. I have had two rigs pointed at a pool, and either I didn't set everything up correctly in my BAT file or in AM... and the pool will show the combined hashrate of both rigs as a single "worker". One pool even called the combined worker "noname".
This has to be defined at the Manage Miner config page in the Options. Below the dropdown where you select a pre-defined pool, you have the option to append a rig name to the worker name. You define the worker name in the Pool settings. The default behavior is to send the "worker" name as the name you put in the pool, then a period, then the rig name. So in the case of Suprnova, if you register with them, your "username" that you login becomes your worker name. But the most important part with Supernova is you have to go to their Worker page and manually create the worker names before you point your rigs at them. Your "username" from Supernova then is the first part of your worker name and you put this in the Pool settings. Then you append the rig name in the Manage Miner config page. Ultimately your "worker name" becomes
username.rigname
In the Pool's dashboards you will see each rig individually like this. Some pools you have to experiment with a little bit, and sometimes the mining software you have to experiment with a little bit in the command line settings you can apply to each Managed Miner. For instance, there is one pool that I can't figure out how to do worker names with their convoluted scheme with AM at all. So in the pool definition page, I only put the URL and nothing else. Then in each Managed Miner in the Command Line options, I specify the settings like so:
--port 3043 --user {wallet address I was mining to here} --pass x
So, as you can see AM is very, very flexible. You can either define your settings in all the proper GUI fields in the Pool definitions and Managed Miners as intended, or you can put the actual BAT commands that you would normally use otherwise in each Managed Miner's config screen. You can even setup templates if you swap around to different pools a lot so that you preserve all those precious commands that you worked hard to cultivate. Or just have a Notepad file full of them and manually copy/paste when you switch pools or settings. Templates are much faster though.
That already exists in the Managed Miner options, unless I'm not understanding your request.