@ William
Connections does not support custom fields so there is not a one to one way to map all of these. Here’s my suggestions; the Connections field is on the right:
Empl ID
Last Name => Last Name
First Name => First Name
Middle Name => Middle Name
Preferred Name
Job Title => Title
Department => Department
Work Location => Suggestion, maybe use the Work Address?
Employee Classification
Employee Status
Phone # Type => Suggestion, Connections support 5 different phone number types, breakout each phone number type into its own column in the CSV and map them accordingly.
Work Phone # => Work Phone Number
Ext No => Suggestion, merge this field with Work Phone Number before you import.
Work Email => Work Email
Manager ID
Manager Name
Last 2 of Payroll Dept #
Organizational Function => Suggestion, maybe use the Organization field?
The remaining items without a map or suggestion … maybe merging them in a single column in the CSV and import them into the Notes field will work for you.
Hope that helps.