Auto change value up to Document Type/subtype

Hi,

I want to customize the one of the frame cells up to document type in drawing. I've looked up a parameter for subtype but I couldn't find. Changing of title isn't very important, I can define as "Dimensions" for all of them. 

If document type is Assembly then:

Title: Dimensions,      Value:   blank or "---"

If document type is sheetmetal then:

Title: Unbend Dimension       Value: Unbended bounding box

If document type is part then: 

Title: Dimensions            Value: Bounding box

Best regards,