You just have to select CRM > Clients > Advanced search and add a condition, then mark the checkbox All except those meeting the conditions. The system will search for all records without the one you've added.
Reversed advanced search
In Sugester not only you can look for records that match chosen conditions, but also for items that don't meet this conditions. It's very useful in a situation when you need to find everything except for one detail, eg. all clients outside a chosen city or the ones without notes on their profile.
You just have to select CRM > Clients > Advanced search and add a condition, then mark the checkbox All except those meeting the conditions. The system will search for all records without the one you've added.

You just have to select CRM > Clients > Advanced search and add a condition, then mark the checkbox All except those meeting the conditions. The system will search for all records without the one you've added.