Navigate to Maintenance > System Administration > Interfaces > Interface Layouts.
For the EMPLOYEE INTERFACE layout, click Edit.
Add the new script you created under Interface Processors.
Reorder the processors.
Note: Scripts that change context data must be performed before CORE PROCESSOR. To avoid issues while changing the order of execution, you should for example, first assign 3 to Execution Order to core processor and then individually set the correct values.
Navigate to Maintenance > System Administration > Job Scheduler and run the Employee Import/Interface job.