Convert BLOB to CLOB

I have create a new arary field in cm3r dbdict, i clicked smalters and the filed was created as BLOB. But all the array fields in cm3r dbdict is of type CLOB. How can iconvert the data type of this new field from BLOB to CLOB?

How can i make it default to be CLOB in the future?

HPSM Version: 9.41 (Codeless)

Databse: Oracle 11.2.03