I've generated a simple chart in Data Studio to show where people went next from our homepage. This is easy using Page as a dimension and filtering:
Previous Page Path = /
But now I realise that '/' includes other homepages for a range of subdomains on our site.
I can't filter them all out, because I need to know if people went there next from the main www homepage. I just want to filter the previous hostnames out where they aren't www.
Is this possible?