You can search for a work contact from your Exchange ActiveSync account, and then copy it on HTC Rhyme.
You need to have your Exchange ActiveSync account set up on HTC Rhyme first.
From the Home screen, tap
In the search box, enter the first few letters of the contact's name or email address.
Under Company contacts, matching names are listed.
Tap the name of the contact you want copied on HTC Rhyme, and then tap Save to People.