When your System Administrator defined the data fields in your database, one of the attributes on each field was Copy Clear. Basically if this attribute is set to Yes on any field than as you create a new contact record using either M (Marked record or A (Above record) the data in those fields will copy over to the new contact record.
A good example of using the attribute Copy Clear Yes would be the data in address and telephone fields. If you are creating a new contact record from an existing record you would want the address and telephone data to copy over to the new record so that you wouldn't have to retype that data. Any field can be made to be Copy Clear Yes. Some other examples are customer or account number fields. This field attribute only comes into play when you are adding a new contact record based on an existing contact record.