Can someone help with how I add a field of type Lookup to an Object/Form in
CRM?

Many thanks,

Hi,
Adding a lookup field means making a relationship with the other entity and
than just adding the relationship attribute on form.

Following URL will explain you in details.
http://www.microsoft.com/dynamics/crm/using/customizing/addlookup.mspx
--
PLEASE do click on Yes or No button if this post was helpful or not for our
feedback.

uMar Khan
Email for direct contact: imumar at gmail dot com