Is there a module that provides a field for referencing values of another field
Field reference module may help you !


  Defines a field type for referencing one field from another.
  
  This module is modelled on Node reference and usage is similar.
  
  Depending on configuration, authors can pick fields from the same
  node/entity, from other nodes/entities, from specific revisions, from
  specific languages, or even a specific delta value within the field.
  Fields can be displayed using either the 'full' or 'teaser' mode from
  their original node/entity.