Hello @Michael_Soprano ,
As far as I know, yes, you can add multiple domains under the same tag property.
You’ll need to set up the Adobe Web SDK extension on all domains involved. This can be achieved by configuring cross-domain tracking.
I just checked this article:
https://terrynwinter.com/adobe-launch-managing-launch-series-part-01-managing-properties/
According to this:
Please make sure to evaluate your marketing needs or use case before implementing this.
Kind regards,
Parvesh