This is a feature available in the desktop app, but not yet in the browser. Maybe this is something in the development pipeline and will be added at a later date? We definitely used/needed this a lot in-house, and am aware that customers do too. If you have e.g. 30 contacts at one division, some emails are not ideal to send out to everyone, and there aren't many other ways of filtering to get this result.
Adding to this, it would be good to have the ability to prioritise certain Roles. This used to be in the desktop app too, and was very useful. It wasn't particularly obvious before in the desktop, but you can drag and drop roles up or down to prioritise them when you use the ‘limit number of contacts by division’ functionality. Was useful if e.g. you wanted to send an email to the key people in the business like Directors, Sales Decision Maker etc. rather than sending to e.g. ‘Unknown’ contact.
This feature is now available