Hard filters

A hard filter completely filters out non-matching TM results. If a TM match does not match the filter conditions, it is completely excluded from lookup results.

You can configure hard filters from either the project template settings section or the project settings section.
Go to Filters > Hard Filter, and under Conditions set a condition by selecting a field (namely the TU field to which the conditions applies), an operator, and a value, and then pressing the plus sign. Add as many conditions as needed, and select the operator that binds them.