The ability to see and search via the standard serviceable unit field “WebSite Ref” was added to TimeTrak from version 19.3 as per below:
Enhancements to Serviceable Units
In TimeTrak from version 22.2.1 there is now the added ability to select multiple serviceable units from the serviceable unit grid, right click edit and update the Lead Provider, Secondary Provider as well as Website Ref field against all serviceable units selected as per below: