can i import field that have been designated as lookup field/or formulas? Key fields?

my apologies.  I was handed this off mid-stream.  Contact Name is the field and is a numeric field (reference); however, under its properties in the reference field options .. is has a proxy field of 'individual policyholder'.  Individual Policyholder it a 'text lookup' (reference proxy).   Under Individual Policyholder's properties, it has a reference field (in this table) of 'Policies: Contact Name' and a value field (in the foreign table) of 'Contacts: Full Name'.