Monitor's subgroups#1549

I have few clients (companies) and few websites for each client. For each website I’m setting few monitors (eg. one for main page, second for another page etc.). So the perfect order of grouping would be in that case:

• “Groups” for companies
• “Subgroups” for websites

And example usage:

• Group: Client A
  – Subgroup: website1.client.com
  — Monitor for page /
  — Monitor for page /shop
  — Monitor for page /login
  – Subgroup: website2.client.com
  — Monitor for page /
  — Monitor for page /shop
  — Monitor for page /login

Such type of grouping would be very handfull.