Assigning Subject to Transaction Type-SDCR

Hi,

I want to assign subject 'Urget Correct(Maintenence)' only to Change Request(SDCR).

When we create Chnage Request, subject 'Urget Correton' should appear by default.

Currently in Subject I can see following options:

Development(Implementation)

Administration(Implementation)

Urgnt Correction(Maintenence)

Normal Correction(Maintenence)

Administration(Maintenence)

Development Activity(Template)

Administration(Template)

Development Activity(Upgrade)

Administration(Upgrade)

Can anybody tell me how to assign specific subject to ugent correcton-SDHF.

Regards

Praveen K